Showa Lifestyle Museum (former Koizumi Family Residence Main House): A Time Capsule of Ordinary Postwar Japan
Tucked into a quiet residential lane in Ōta Ward, Tokyo, stands a modest two-story wooden house that looks, at first glance, like any number of postwar Japanese homes. Step through its small gate, however, and you enter something far rarer: an entire family's life, preserved exactly as it was lived. The Showa Lifestyle Museum (Shōwa no Kurashi Hakubutsukan) occupies the former Koizumi Family Residence, a tiny 18-tsubo (about 59.5 m²) house built in 1951 that is now a nationally Registered Tangible Cultural Property. The furniture, the kitchen utensils, the children's notebooks, even the ice box in the corner — everything remains where the Koizumi family left it. For visitors from abroad, it is perhaps the most intimate window into everyday Japan in the decade after the Second World War that exists anywhere in Tokyo.
A House Born from a Nation Rebuilding Itself
The story of this house is inseparable from the story of postwar Japan. In 1950, the Japanese government launched the Japan Housing Finance Corporation (Jūtaku Kinyū Kōko) to help ordinary citizens recover from the devastation of the war by providing low-interest loans for building their own homes. The corporation's strict rules capped the floor area at just 18 tsubo — roughly 59.5 square meters — and specified approved materials and construction methods, which officials inspected carefully.
Koizumi Takashi, an architectural engineer employed by the Tokyo Metropolitan Government, happened to be one of the officials who administered that very inspection process. When it came time to build a home for his own family of six, he knew the rules intimately. In August 1951, working within the 18-tsubo limit, he designed and completed the small two-story house that stands today. The construction cost 378,000 yen. There was no gas, no running water, and no bath: meals were cooked on a wood-burning stove under a lean-to at the back, water came from a neighbor's well, and the family walked to the public bathhouse in the evenings. For all that, the house was considered a small triumph of thrift and ingenuity.
Six people lived here — husband, wife, and four daughters — along with two lodgers whose rent helped pay off the housing loan. A university student occupied the south room upstairs; a young salaryman lived in the north. The family and their tenants shared a single toilet and washed their faces at the kitchen sink. This was, unremarkably, how millions of Japanese families lived in the years that shaped modern Japan.
Why an Ordinary House Became a National Cultural Property
On 25 June 2002, only a little over fifty years after its completion, the main house was added to Japan's register of Tangible Cultural Properties. The designation is reserved for structures at least fifty years old that contribute to the nation's historic landscape, set a standard of craftsmanship, or would be difficult to reproduce. The official assessment praised the building as "a fine example of an ordinary postwar reconstruction-era dwelling, whose clear plan and form, achieved within the 18-tsubo loan limit, shows the ingenuity of public-finance housing of that period."
What makes the designation remarkable is its subject. Japan's cultural property system has long celebrated temples, castles, and the homes of samurai and wealthy merchants. The Koizumi house was none of these. It is one of the first truly humble, middle-class postwar homes to be recognized at the national level — a quiet acknowledgement that the lives of ordinary citizens are also worth preserving. Within Japan it is sometimes called "a small national treasure that is still young," having been registered almost as soon as it became eligible.
The museum was the vision of Koizumi Kazuko, Takashi's eldest daughter. A scholar of Japanese furniture and interior history who earned her doctorate at the University of Tokyo, she had spent her career watching ordinary objects of daily life disappear without record. When the house became unoccupied after her sister's death, she resolved not to tear it down but to preserve it — along with every teacup, tatami mat, and chest of drawers inside — and open it to the public as a museum in February 1999. In 2025 Professor Koizumi and the museum were jointly awarded the 73rd Kikuchi Kan Prize, one of Japan's most respected cultural honors.
What You Will See Inside
The experience of visiting is deliberately unlike that of a conventional museum. There are no glass cases and no velvet ropes. Instead, you are invited to sit on the veranda, peek into the kitchen, and feel what it was like to live here.
The ground floor is arranged exactly as the Koizumi family used it: a small reception room that doubled as the father's study, a four-and-a-half-mat family room (cha-no-ma) with a sunken kotatsu heater at its center, a kitchen with an old ice refrigerator, and a six-mat tatami guest room. Clever built-in details — a through-column running the full fifteen feet from floor to roof, a sloped ceiling to save timber, built-in cabinets, and the practical placement of a chest-of-drawers niche — reveal Takashi's professional eye and give the house its reputation as a textbook example of loan-financed design.
Upstairs, two small four-and-a-half-mat rooms that once housed the lodgers and, later, the Koizumi daughters now serve as a gallery space, a special exhibition room, and the Koizumi Tomoyo Memorial Room, dedicated to the second daughter, a graphic designer and batik artist. In a glass case in the children's room sits a wonderfully nostalgic collection of caramel boxes from the 1950s and 1960s — Fujiya, Glico, Meiji — each a small design history in itself.
Animation fans may recognize the house from another context entirely: the acclaimed 2016 Japanese animated film "In This Corner of the World" (Kono Sekai no Katasumi ni), directed by Sunao Katabuchi, drew on the museum's collections for the depiction of protagonist Suzu's wartime household. A special exhibition on the film, "Suzu-san's House," has been held here in the past.
Planning Your Visit
The museum is open Fridays, Saturdays, Sundays, and national holidays, from 10:00 to 17:00. It is closed on Mondays through Thursdays, in early September, and during the New Year period. Check the museum's online calendar before travelling, as the house occasionally closes for events or group tours.
Admission to the main house is 1,000 yen for adults and 500 yen for elementary through high school students; preschool children enter free. Holders of a disability certificate receive a 50% discount, and one accompanying person may receive the same discount. A separate annex, "The Room of Painter Yoshii Tadashi," is available for an additional 500 yen or as part of a 1,400-yen combined ticket. Admission fees go directly toward preserving and maintaining this Registered Tangible Cultural Property.
The museum is small and staffed by a modest team, so the atmosphere is quiet and personal. Photography rules vary by room, so please ask at reception. Shoes come off at the entrance, as in any private Japanese home — in fact, the entire visit feels less like touring a museum than being welcomed into someone's grandparents' house for an afternoon.
Getting There and Exploring the Neighborhood
The museum is an approximately eight-minute walk from Kuga-hara Station on the Tōkyū Ikegami Line, or eight minutes from Shimomaruko Station on the Tōkyū Tamagawa Line. Both lines are easily reached from central Tokyo via Gotanda or Kamata. There is no dedicated parking, and the streets of the neighborhood are narrow and one-way, so public transport is strongly recommended. Note the address carefully: the museum is in Minami-Kugahara 2-chome, not Kugahara 2-chome — a common source of confusion.
Since the museum sits in a quiet residential pocket of southwestern Ōta Ward, it pairs naturally with other nearby attractions. Ikegami Honmon-ji, the head temple of the Nichiren sect of Buddhism, is one stop away on the Ikegami Line and is home to the oldest surviving five-story pagoda in the Kantō region — an Important Cultural Property. The Tamagawa riverside, a favorite Tokyo walking and cycling course, lies a short walk west of the museum and offers sweeping views toward Kawasaki. For those interested in ancient Japan, the Kamehakuzan Kofun, one of the largest keyhole-shaped burial mounds in Tokyo, is located in the adjoining Tamagawadai Park. A visit to the Showa Lifestyle Museum therefore fits beautifully into a half-day itinerary exploring the quieter southern reaches of Tokyo.
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Q&A
- How long should I plan for a visit?
- Most visitors spend between 45 minutes and 90 minutes. The house itself is compact, but there is a great deal of detail to notice, and many guests like to linger on the veranda or in the tatami room to absorb the atmosphere. Allow extra time if a special exhibition is on.
- Is English signage available?
- The museum is small and run by a modest staff, so English signage is limited. That said, the objects themselves tell much of the story, and visual cues — a lunch box, a sewing machine, a schoolchild's desk — are instantly legible. A pocket translation app is useful for reading exhibition panels.
- Can I take photographs inside?
- Photography policy varies depending on the current exhibition and the room, so please check at the reception desk on arrival. In general, the permanent display of the house interior is photograph-friendly for personal use, while some special exhibitions have restrictions.
- Is the house accessible for visitors with limited mobility?
- Because the museum preserves the original 1951 building, there are steps at the entrance and narrow interior passages typical of a small Japanese home of the period. The upper floor is reached by a steep traditional staircase. Visitors with mobility concerns are welcome to enjoy the ground floor, the garden, and the museum shop, which are accessible from the entrance. Please contact the museum in advance for details.
- What makes this museum different from other historic-house museums in Japan?
- Most preserved historic houses in Japan belong to samurai, wealthy merchants, or literary figures. The Koizumi house represents something much rarer: an ordinary middle-class family home from the early postwar reconstruction period, preserved with all its original furniture and daily objects. It offers a kind of intimate social history that is otherwise almost impossible to encounter in a museum setting.
Basic Information
| Name | Showa Lifestyle Museum (former Koizumi Family Residence Main House) / 昭和のくらし博物館（旧小泉家住宅主屋） |
|---|---|
| Cultural Property Classification | Registered Tangible Cultural Property (Structure), registered 25 June 2002 |
| Construction Date | August 1951 (Showa 26) |
| Designer | Koizumi Takashi (architectural engineer, Tokyo Metropolitan Government) |
| Structure | Two-story wooden building, tile roof; building area 39 m²; total floor area approximately 59.5 m² (18 tsubo) |
| Operator | NPO Showa Lifestyle Museum (operated as a museum since 28 February 1999) |
| Address | 2-26-19 Minami-Kugahara, Ōta-ku, Tokyo 146-0084 |
| Access | Approximately 8 minutes on foot from Kuga-hara Station (Tōkyū Ikegami Line); approximately 8 minutes on foot from Shimomaruko Station (Tōkyū Tamagawa Line) |
| Opening Hours | Fridays, Saturdays, Sundays, and national holidays, 10:00–17:00 |
| Closed | Mondays–Thursdays, early September, and New Year period |
| Admission | Adults 1,000 yen; elementary–high school students 500 yen; preschool children free (main house) |
| Telephone | +81 3-3750-1808 |
References
- 昭和のくらし博物館（旧小泉家住宅主屋） — Cultural Heritage Online (Agency for Cultural Affairs)
- https://online.bunka.go.jp/heritages/detail/193759
- 小泉家住宅主屋 — National Designated Cultural Properties Database (Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00002759
- 旧小泉家住宅について — Showa Lifestyle Museum Official Website
- https://www.showanokurashi.com/about/house/
- 施設案内・アクセス — Showa Lifestyle Museum Official Website
- https://www.showanokurashi.com/guide/facilities/
- 昭和のくらし博物館について — Showa Lifestyle Museum Official Website
- https://www.showanokurashi.com/about/museum/
- 昭和のくらし博物館 — Wikipedia (Japanese)
- https://ja.wikipedia.org/wiki/昭和のくらし博物館
Last verified: 2026.04.21