Niosaka Family Residence (Tsuruya Honten) Retirement Room

Sagisaka Family Residence (Tsuruya Honten) Inkyo-beya: A Taisho-Era Retirement Quarters on the Historic Tokaido

Standing quietly along the old main street of Mitsuke-juku, the 28th post town on the historic Tokaido highway, the Sagisaka Family Residence (Tsuruya Honten) Inkyo-beya is a refined example of early 20th-century Japanese domestic architecture. Registered as a National Tangible Cultural Property in March 2024, this elegant retirement quarters speaks to a time when prosperous merchant families expressed their taste and status through the artful design of private living spaces. The building belongs to the Sagisaka family, proprietors of Tsuruya Honten, a miso and soy sauce brewery that has long been a fixture of the Mitsuke community in Iwata City, Shizuoka Prefecture.

Historical Background: The Sagisaka Family and the Tsuruya Honten Brewery

The Sagisaka family established themselves as miso and soy sauce brewers in the heart of Mitsuke-juku, one of the most important post towns along the Tokaido, the great highway connecting Edo (modern Tokyo) with Kyoto. Mitsuke-juku prospered as a strategic waypoint: it served as the seat of the provincial government of Totomi Province from the 10th century onward and later developed into a bustling commercial center where travelers, merchants, and pilgrims converged.

The Tsuruya Honten brewery grew alongside this community, producing essential fermented condiments — miso paste and soy sauce — that were staples of Japanese cuisine. By the Taisho era (1912–1926), the Sagisaka family had accumulated sufficient wealth and social standing to commission the construction of a dedicated retirement quarters, or inkyo-beya, for the senior generation of the household. Completed in 1923 (Taisho 12), the building reflects both the family's refined aesthetic sensibilities and the architectural trends of the period, when traditional Japanese craftsmanship was being thoughtfully blended with modern comforts.

Why It Was Designated: The Significance of the Inkyo-beya

The Sagisaka Family Inkyo-beya was registered as a National Tangible Cultural Property (Registered Tangible Cultural Property — Buildings) on March 6, 2024, as part of a broader effort by Japan's Agency for Cultural Affairs to preserve the rich built heritage of the nation's historic communities. The registration recognizes the building on several grounds.

First, the inkyo-beya is a fine example of modern Japanese-style residential architecture (kindai wafu jutaku) from the Taisho period. Its tatami-floored reception rooms (zashiki) incorporate sophisticated design elements such as hira-shoin alcoves with shitaji-mado (exposed-lattice windows), lending the interiors a refined yet understated elegance that characterizes the best of Japan's pre-war domestic architecture.

Second, the building contributes significantly to the historic streetscape of Mitsuke-juku. Facing east onto the old Tokaido thoroughfare, it preserves the visual continuity of a post-town landscape that has been shaped over centuries. Together with the adjacent three-story bunko-gura (document storehouse), also registered as a cultural property, it forms an ensemble that evokes the prosperity of Mitsuke's merchant class.

Third, the building is closely tied to the local brewing industry, which played a central role in the economic and cultural life of the Tokaido post towns. As such, it serves as a tangible link to the region's traditions of food production and commerce.

Architectural Highlights: A Closer Look at the Design

The inkyo-beya is a two-story wooden structure with a san-gawara (interlocking tile) roof, oriented on a north-south axis. Its total building area is approximately 49 square meters. The main entrance is positioned on the south side of the east-facing facade, welcoming visitors from the direction of the old Tokaido road.

The interior layout follows a classic Japanese residential plan, with continuous tatami-floored rooms (tsuzuki-ma zashiki) on both the ground and upper floors. Each level features an engawa (veranda corridor) running along the south and west sides, allowing residents to enjoy views of the garden and the changing seasons while remaining sheltered from the elements.

The zashiki rooms are the architectural centerpiece. Designed in the hira-shoin style, they feature shitaji-mado — windows with partially exposed bamboo or wooden lattice beneath a layer of plaster — that create a play of light and shadow characteristic of refined tea-room aesthetics. These elements, combined with carefully proportioned tokonoma alcoves and other decorative details, reflect a design philosophy that values subtlety and restraint over ostentation.

Adjoining the inkyo-beya on its north side is the bunko-gura, a three-story storehouse built in 1917 (Taisho 6). Constructed in the traditional dozo-zukuri (earthen-walled storehouse) style, it features plastered white walls with two tiers of mizukiri (drip moldings), Izu stone foundations laid in nuno-zumi (cloth-stacking) patterns, and kakeko-nuri (raised-panel) double-leaf doors on both gable ends. The first floor stored tableware, the second floor bedding and clothing, and the third floor documents and tools — a practical arrangement that also served as fire protection for the family's most valued possessions.

Visiting the Sagisaka Family Residence

The Sagisaka Family Residence is located at 3497 Mitsuke, Iwata City, Shizuoka Prefecture, in the heart of the historic Mitsuke-juku district. As a private residence and active brewery, the interior is not generally open to public viewing. However, the exterior of the inkyo-beya and the impressive three-story bunko-gura can be appreciated from the street, offering a vivid sense of the post town's mercantile past.

Visitors traveling by train should take the JR Tokaido Main Line to Iwata Station, from which the Mitsuke area is accessible by Entetsu Bus (approximately 10 minutes to the Mitsuke bus stop). By car, the area is about 7 minutes from the Iwata Interchange on the Tomei Expressway or about 5 minutes from the Mitsuke Interchange on the Iwata Bypass.

A stroll through the Mitsuke-juku district reveals numerous traces of its Tokaido heritage, from traditional shopfronts and historic markers to the gentle rhythm of a streetscape that has evolved over centuries without losing its essential character.

Surrounding Attractions

The Mitsuke area is rich in historical and cultural landmarks that complement a visit to the Sagisaka Family Residence. Nearby, the former Mitsuke School (Kyu Mitsuke Gakko) is Japan's oldest surviving wooden Western-style elementary school building, completed in 1875. Designated as a National Historic Site, it now serves as an education museum displaying textbooks, classroom models, and everyday objects from the Meiji and Taisho eras.

A short walk uphill leads to the Mitsuke Tenjin Shrine (formally known as Yanahime Shrine), one of the most revered Tenjin shrines in the Tokai region. Dedicated to the deity Yanahime-no-Mikoto and enshrining the spirit of Sugawara no Michizane, the patron saint of learning, the shrine draws students and families from across the prefecture. Its grounds are also famous for the legend of Shippei Taro, a heroic dog said to have saved the town from a supernatural menace — the story is commemorated with a bronze statue and lends Iwata City its beloved mascot character, Shippei.

The Mitsuke Tenjin Hadaka Matsuri (Naked Festival), designated as a National Important Intangible Folk Cultural Property, is one of the region's most spectacular events, held annually in late summer. For nature enthusiasts, the Tonbo (Dragonfly) Nature Park, located nearby, boasts the highest number of dragonfly species of any site in Japan, with 71 recorded species.

Other notable registered cultural properties in the Mitsuke area include the Ohashi Sake Shop storehouses, which together with the Sagisaka Family buildings create a remarkable cluster of heritage architecture along the old Tokaido route.