SLEEP CAPSULE
A constantly evolving comfort space.
Kotobuki Seating created the world’s first capsule bed, called a Sleep Capsule, and ever since, we have made it our mission to explore just how comfortable we can make limited space for over 40 years.
Today, the capsule hotel is garnering popularity among young people and visitors from abroad as a stylish and comfortable micro-space.
With their ability to relax the body and the mind, Sleep Capsules also meet needs in the workplace.
More and more facilities and companies are using Sleep Capsules to improve the staff napping environment and safeguard their physical and mental health.
We provide comfortable sleep to a diversely changing society. Sleep Capsules continue to evolve with the times.
From large hotels with hundreds of beds to small hotels with several dozen beds.
Kotobuki Seating capsule bed Sleep Capsule is used in numerous accommodation facilities, for all kinds of layout sizes and facility sizes. And these capsule beds actually provide the optimal sleeping experience through their durability, sound insulation, and thermal insulation.
The installing process
The ultimate napping facilities to help improve work efficiency
For staff members who work full time in places like airports, police departments, hospitals, and fire departments, resting time with sleep is an important factor for working smoothly. Because capsule beds can be installed efficiently even in small spaces, they provide the optimal environment for jobs that require 24-hour on-call status.
*The time lengths are estimates and may change depending on the number of beds or other factors. For details, please contact us.
We recommend that you try out actual beds in our showroom. Experience the comfort of a capsule yourself.
5 Deciding on specs
You choose the colors of features like panels and roller blinds.
Based on an initial meeting, we check the measurements of the planned space and create a blueprint.
We supply you with an estimate based on what was discussed in the meetings.
After you sign a contract, we begin working on your beds.
6 Delivery, assembly, and setup
We deliver the parts, assemble them, and complete the setup.
We can provide antibacterial treatment as an
After the beds are complete, they can be used immediately.
is born
Top FRP* product manufacturer
Kotobuki Seating created the physical bed product based on designs by Kisho Kurokawa, and the world’s first capsule bed Sleep Capsule was born. To attain comfort, a monocoque structure* was used. We realized a compact personal living space that also combines the convenience of being able to operate the various equipment within reach, just like an aircraft cockpit.
FRP: Glass fiber reinforced plastic. It enables the forming of curved surfaces, gives a high design flexibility, and is immensely durable.
Monocoque structure: A structure that enables large internal spaces due to the external plating being a strong component. It is often used in automobiles, etc.
Entering the 1980s, in addition to the standard front entry bed, the side entry bed and the No. 80 with its ability to combine front and side entry beds appeared. In order to respond to demand from non-hotel clients, we started selling beds without televisions and radios as napping beds for company employees. In 1985, we delivered 92 capsule beds to Hotel Okura. Afterwards, we delivered beds to places like Hotel Grand Palace and the Imperial Hotel. Additionally, our service scope expanded to include delivery companies, airline companies, gas and electricity companies, JR, fire departments, police stations, and television stations.
Entering the 2000s, cabin beds that were almost like small private hotel rooms appeared. These had a private room format, with the interior taking up the top and bottom space, and entrances installed opposite to each other on the right and left, in addition to features like a writing desk and a storage locker in the front space. The attention to making this feel like a private space made it popular. After the 2008 financial crisis, demand rose for traveling at reasonable prices using low-cost carriers. Along with this, capsule hotels began to grow out of their previous image, expanding to be popularly considered safe facilities for women to stay as well.
Capsule beds installed in the Hotel Century Hyatt Tokyo
Capsule Inn Osaka, the first capsule hotel, opens in 1979
Seating Sleep Capsule,
Capsules for storage and
Capsules for
2019 saw the addition of the staggered layout SPACE D2 series (left) and the private room type VISIT- E series (below).
After experiencing the 2011 Tohoku Earthquake and Tsunami, the role of the capsule bed was rethought. Disaster safety center storage spaces assembled from prefabricated nonflammable aluminum panels could be used as capsule beds during disasters. And the CUBE series is what emerged in 2012 as a product line that deployed this idea. In 2014, capsules assembled from prefabricated composite panels transformed into the SPACE D series. Following this, in 2015 FRP products were discontinued.
Sleep Capsules assembled from prefabricated panels that no longer needed molds transformed into stylish environments. The design for SPACE D was crafted by GK Industrial Design Inc., and nonflammable laminated panels from Sekisui Jushi Plametal Corporation are used for the aluminum resin composite plates. This heralded the birth of a next generation Sleep Capsule with advances in design, materials, and cost.
2025-
The new release ThreeP (Sleep). This is the newest format that not only increased the private room feel with curtains, but also realized amazing storage space and a comfortably high ceiling.
We released the DREAM-C with a refined exterior appearance and high level of versatility. Demand as a Sleep Capsule that can be installed worldwide is increasing. In 2024, the GS-CUBE appeared as a successor product to the B-CUBE. It has a base wood tone that matches with all sorts of different kinds of spaces with a design that is perfect not only for hotel use, but also for napping rooms in facilities and installation in existing buildings and hotels. Then, in 2025, we released our newest model, the ThreeP (Sleep). Diversified Sleep Capsules continue to evolve as a personal space that is ever safer and more customizable to a variety of purposes.
S-CUBE
B-CUBE
GS-CUBE Series
Next-generation Basic Model: Blends Well into Any Space with Its Modern Design
The simple yet elegant design profile and wood-panel finish is suitable for both new builds and existing spaces.
The easy-to-use ladder and smoothly contoured interior fit-out create an impressively spacious private space with plenty of room to stretch out and relax.
Color Sample / Specification
Type V (GSCUBE-V) Front Entry
Type H (GSCUBE-H) Side Entry (Layout : Tandem)
Type M (GSCUBE-M) Side Entry (Layout : Individual)
❶ Number Plate Synthetic resin injection molding
❷ Interior Panel Multi-layered fascia panel
❸ Exterior Panel Multi-layered fascia panel
❹ Hand Rail Steel pipe baked coated synthetic resin
❺ Steps Synthetic resin injection molding, Anti-slip sheet
❻ Mini Deck MDF painted finish
❼ Headboard Multi-layered fascia panel
❽ Indirect Lighting LED
❾Accessory Pocket Synthetic resin injection molding
❿ Night Panel Light switch, fan switch, 100V 2 outlets
⓫ Curtain Fire-proof, blackout material
Structure Panel Aluminum alloy injection molding and composite panels
Ventilation Fan Synthetic resin injection molding (DC fan)
Floor Panel Zinc plated steel
Accessory Pocket
Night Panel
Hanger Hook Mirror
Backrest Mesh Pad
Type V (SPACED-V) Front Entry
Type H (SPACED-H) Side Entry (Layout : Tandem)
Type M (SPACED-M) Side Entry (Layout : Individual)
❶ Number Plate Aluminum alumite finish
❷Interior Panel Non-combustible panel
❸Headboard Steel
Lower part: Molded synthetic resin polyurethane foam upholtered pad
❹Dimmer Light LED
❺Indirect Lighting LED
❻Accessory Pocket Steel enamel finish, 100V 1 outlet, USB jack
❼Night Panel Dimmable light adjustment knob, Light switch, Fan switch
❽Ventilation Fan Synthetic resin injection molding (DC fan), Louver : Aluminum alumite finish
Structure Frame Steel powder coated
Exterior Joint Steel enamel finish
Floor Panel Steel powder coated
Matress Fireproof t100
Bed Pad Fireproof t100
Level Liner Zinc plated steel
Options
The ultimate in stylish modern, our deluxe capsule bed series
Achieving a stylish and modern exterior while fulfilling the required functions. Our design, which pursues comfort, safety, and durability, has earned high acclaim both domestically and internationally.
Headboard Pad
Stucco White White Wood Grain - Natural Black
Color Sample
Hanger Hook
TV Table Mirror
Security box
Indirect Lighting (Multi-color, 7-color support) Storage
TV remete control holder Drink holder
Vertical Frame
Horizontal Frame
SPACE D2 Series
The series with a staggered layout and front panel customizability
The next evolutionary installment of the SPACE D series. It features a staggered layout that alternates bed placement, making access to the upper bed easier than ever.
The level of customizability is high, with options like using wood for the front panel.
Dimmer Light
TV Mirror Security box
Indirect Lighting (Multi-color, 7-color support)
Accessory Pocket (Without USB and power outlet)
holder
DREAM-C Series
Floor
Bed
Level
Color Coordination
Sophisticated Appearance and High Versatility
Wide opening for smooth entry and exit. A ladder for easy elevation and a flexible design that allows the use of thick mattresses. Capsule beds that can be installed worldwide. Three color-coordinated patterns are available for the exterior frame. A variety of combinations create an expressive appearance that meets your needs.
Combi.A
Combi.C
Combi.B
Exterior Frame
Headboard Pad
White Wood Grain - White Wood Grain - Natural
Black Black Black Black Wood Grain - Natural Wood Grain - Black
Wood Grain - Black
Color Sample
Combi.A Combi.B Combi.C
Silver Blue Orange
Horizontal Frame
Vertical Frame
Location : Tokyo
Client : Bagus Co.,Ltd.
Design : Hagiwara Architectural Design Co.,Ltd.
Interior Design : GLAMOROUS co., ltd. Beds : 128 Opened : 10.2017
Glansit is a word that combines “glamping,” which means luxurious camping, and “transit.” This is a wellregarded hotel with a name that reflects both a design redolent of nature and an amazing location just a three-minute walk from Akihabara Station. The unique interior design, featuring wood elements and lush greenery throughout the entire building was crafted by GLAMOROUS Co., Ltd., the company represented by designer Yasumichi Morita, with the lobby and café style free-lounge featuring light woodgrain, and the bed area unified in calm dark brown. The hotel offers standard, twin, and semi-private rooms with desks. And, high-quality mattresses and humidifiers have been adopted. This hotel provides the ultimate in convenience in a downtown hub that meets diverse needs and is one rank higher than the rest.
Location : Hokkaido
Niseko Moiwa Ski Resort, Hokkaido, enthrals skiers from all over the world with its abundance of powder snow. The Lodge Moiwa 834 opened recently as a long-stay capsule hotel in the foothills of this mountain resort. KOTOBUKI SEATING delivered two types of SPACE D beds here: two-tier beds, and bespoke capsules where the lower section can be used as a space for storing luggage. This custom specification also features power sockets, wall-fitted foldaway tables, clothes-hanger racks and password-protected safes in which valuables can be stored. The most distinctive feature is that it enables guests to choose the colour of the LED lighting in their capsule. This unique touch was to offer guests variation in their stay and visual relief for lodgers who spend their whole day in a stark white, snowy world.
Location : Yamanashi
Client : FUJIKYUKO.CO.,LTD
Beds : 42
Opened : 7.2014
New privacy-ensuring capsule-style guest rooms were installed at the Fujiyama Lodge at Fujikyu Unjokaku, which stands at Mount Fuji’s fifth station. The secret to succeeding in the challenge of climbing the 3,776m of Mount Fuji is to stay overnight at the fifth station and acclimatize to the low air pressure. The lodge has introduced a pay-by-the-hour system to allow climbers flexibility and to make optimal use of their rest periods, giving them the best chance to conquer the mountain.
East Anglian Air Ambulance
Location : Norwich, United Kingdom
Client : East Anglian Air Ambulance
Beds : 6
Opened : 5.2021
East Anglian Air Ambulance in the United Kingdom is a charity that helps save lives by rapidly placing doctors and critical care paramedics throughout the entire region. In 2021, through the Kotobuki Seating group company Audience Systems, Ltd., they introduced Sleep Capsules for all crew members, available to not only doctors and rescue workers, but pilots as well. The capsules, installed in small rooms measuring just 4.1 by 3.6 meters, are mainly used for rest during night shifts starting around 1:00 a.m. and have received high praise. This means that Japanese sleep capsules are now being used even at emergency sites in the United Kingdom. The promotion of these capsules is also progressing in Japan, as more attention is being given to providing comfortable and private resting environments — such as duty rooms in fire departments and hospitals, as well as nap rooms in public transportation facilities like airports, train stations, and bus terminals.
Photo: Sarah Toon
SoftBank Omiya Center
Location : Saitama
Client : Softbank Group Corp
Beds : 16
Completed : 6.2014
In early summer 2014, the SoftBank Omiya Centre was completed. Here, a total of 16 beds were supplied: 12 beds for the men’s nap room, and 4 beds for the women’s nap room. The capsule beds supplied were the latest SPACE D series. The interior walls were finished in stucco white, creating a sense of simplicity and cleanliness. Members of various departments take it in turns to come to the rooms and rest on the beds, avoiding the fixed times that are scheduled for linen change. The capsules used by each department are allocated a location, which it seems helps to alleviate congestion. Capsule beds establish a private space where employees can enjoy a peaceful sleep, and good quality sleep enhances the quality of work.
Duty Room, Yokohama City University Hospital
Training Building
Location : Kanagawa
Client : Yokohama City University Hospital
Beds : 6
Delivery : 3.2025
A new men’s duty room was established in the training building of Yokohama City University Hospital. Previously, a different duty room on the same floor had been used, but since it was connected to the changing room, turning on the light to change clothes would disturb other staff members who were sleeping, making improvement necessary.In response to the hospital’s request for a quick solution, the issue was resolved in just about three months. In March 2025, six beds from the GS-CUBE series were installed in a newly renovated duty room, converted from a former restroom.Among Kotobuki Seating’s extensive product lineup, the GS-CUBE is particularly notable for minimizing protruding parts to create a smooth, sleek bed space. By redesigning the prefabricated panel assembly structure used in previous capsule bed models, we developed a simpler construction method in which panels are inserted directly into the braces, dramatically shortening the assembly time.
Kami-Shakujii
Station Napping Room in the Wire Maintenance Station, Seibu Railway
Location : Tokyo
Client : SEIBU RAILWAY
Beds : 12
Delivery : 3.2023
At the railway maintenance station in the Kami-Shakujii Station on the Seibu Shinjuku Line, capsule beds for napping before late night work were introduced for the mental and physical health of the employees. Railway maintenance work, which is especially important among the many jobs at a railway company, requires nighttime work in the limited time from the last train of the day to the first train of the morning in order to maintain a safe and secure railroad that is pleasant to ride. What was installed were HEPA filter equipped capsule beds based on the panel assembly DREAM-C series. The sliding doors for the bed entrances were designed for the best in airtightness, and when they close, the air flow channel is restricted to the HEPA filters. Because droplets in the air are collected when the air passes through these filters, the capsule beds always maintain a clean environment, and the risk of catching an infectious disease can be reduced. This also lets the company provide a high-motivation environment that is easy to work in, and is expected to lead to attracting new employees to carry on the future of railway work.
Location
Emergency Nap Room / Nap Room, Shimamoto Fire Department
The napping rooms at the Shimamoto town fire department headquarters, which is responsible for the entire Shimamoto town area in Osaka Prefecture are split into two types: the emergency napping room used by firefighters who are ready to mobilize equipped with a notification sound that plays before a mobilization order is issued, and a regular napping room that is used by other firefighters. Previously, the beds were separated by a partition and a curtain, but sounds and light interfered with sleep, and there were also concerns about the spread of infectious illnesses. The capsule beds that were used for this project were Sleep Capsules with HEPA filters, which help prevent the spread of infectious diseases. The HEPA filters in the capsules capture extremely small airborne particles, including not only viruses, but also pollen and dust. The bed entrance uses a sliding door. In addition to blocking droplets, the capsules dramatically reduce sleep interference like noise and light. Firefighters have praised the capsules highly, saying they are almost like having a private room and provide a calm, personal space.
Nap Room and Duty Room, Yamaguchi University Hospital
New Ward (Ward A)
Location : Yamaguchi
Client : Yamaguchi University
Design : Yamaguchi University Facilities and Environment Department, AXS SATOW INC.
Beds : 12 *nap room : 4, duty room : 8
Opened : 6.2019
Napping rooms and duty rooms were established in the new building (Building A) of the Yamaguchi University Hospital. In the construction of the new hospital building, many considerations were given not only to providing the best facilities for visitors and inpatients, also to creating a physically and mentally supportive working environment for doctors and nurses. Sleeping areas in previous hospital buildings were the kind of general bunk beds that can be used in the home. There were problems like the surrounding light and noise being bothersome, and vibrations from both the top and bottom bunks shaking each other. What was introduced to solve these problems was a capsule bed that ensured the necessary facilities through a simple design. The capsule interior contains features perfect not only for napping, but also for short breaks, such as LED light that can be dimmed to any level, a digital clock with an alarm, a small table for personal items, and a socket for charging electrical devices like smartphones.
Nap Room, NEXCO Central Nippon (Central Nippon Expressway Company Limited) Hokuriku Expressway, Takefu IC
Location : Fukui
Client : Central Nippon Expressway Company Limited
Beds : 34
Opened : 12.2020
In December 2020, the Takefu IC Management Facility (Station for Snow/Ice Removal Staff) on the Hokuriku Expressway, which is under the jurisdiction of Central Nippon Expressway Company Limited’s (NEXCO Central) Kanazawa branch was reopened after being relocated. At this facility, which also operates as a station for the staff responsible for snow and ice removal from expressways, it is not uncommon for workers to work day and night to remove snow and ice, and spraying antifreeze agents during the snow season. With the relocation and reopening of this facility, 34 capsule beds were installed to provide workers with quality rest and a comfortable nap experience during physically demanding work. The model selected for this project has panels and a blackout curtain at the doorway, which not only ensures privacy from the surroundings, but also minimizes the light and noise from the nap room entering the capsule bed. Light and sound caused by the entry and exit of other workers in the nap room do not interfere with your good night’s sleep. A survey conducted after the installation of these capsule beds showed a high level of satisfaction.
6m×9m=54m2
Bed 32 beds
Tandem (Front Entry) Ex.
Tandem (Side Entry) Ex.
Individual (Side Entry) Ex.
SPACE D
Type M
Floor Space
3m×2.5m=7.5m2
Capsule Bed 2 beds
Placing the capsule bed in the center of a two-person structure save space while also ensuring the privacy for each room.
GLANSIT AKIHABARA
Operation Model
In recent years, increasing numbers of women have been using capsule hotels. This model demonstrates discrete, fullyserviced areas for men and women, ensuring optimal safety and comfort for guests.
Capsule Bed 64 beds (165m 2)
Locker Room (66)
Reception Desk ❷ Locker Room (103)
Women's Floor, Reception Desk (500m 2)
Men's Floor (500m 2)
Men's Floor (500m 2)
Separate zones for men and for women (by floor, area)
Locks using security cards S Men Women
Some capsule hotels also provide spaces for relaxing and refreshments. By offering additional amenities, hotels can differentiate themselves from their competitors and create secondary revenue streams through complementary guest-facilities. Hotels can provide around-the-clock service by offering the use of nap facilities.
Shoe Storage (270)
❶ Capsule Bed
❷ Locker Room
❸ Reception Desk
GS-CUBE
Series
Type V
Front Entry
Type H
Side Entry (Layout : Tandem)
Type M
Side Entry (Layout : Individual)
DREAM-C
Series
Side Entry
SHOWROOM
Enjoy a tour in our showroom from 10:00 – 17:00 on weekdays (reservations required).
Feel, get in, and sleep in actual capsule beds. You’ll definitely want to experience this comfort.
1-2-1, Kanda Surugadai, Chiyoda-ku, Tokyo 101-0052, Japan
Sleep Capsule Division
501 Sho-ryu Kan build., 3-28-7, Kanda Ogawa-machi, Chiyoda-ku, Tokyo 101-0052, Japan
TEL: +81-(0)3-5280-5606
https://www.kotobuki-sleep-capsule.com/en/