Oshima Family Tea House

A copy of a lord's tea room, hidden behind a house

The Oshima Family Tea House (大島家住宅茶室, Ōshima-ke jūtaku chashitsu) is a four-and-a-half-mat tea room built in 1826 on a private plot in the Nishikoken block of the castle town of Inuyama, Aichi Prefecture, and it was entered on Japan's register of Registered Tangible Cultural Properties in 2013. It is timber-framed, single storey, tiled, and covers only 43 square meters.

The construction date is firm rather than estimated. A munafuda, the dated wooden tablet nailed to a ridge beam when a Japanese building is raised, survives and gives the ninth year of the Bunsei era, 1826.

The building stands at the far west of the south side of the main house, facing east. Nothing of it is visible from the public road.

Where it came from

Inuyama City records connect the tea room to the Naruse family, who held Inuyama Castle for more than 250 years until 1869.

In 1823 Naruse Masanaga, the seventh lord, had a tea room built. A copy of it was then requested for Zuisenji temple, and that copy is understood to be this building, completed three years later in 1826.

At the Meiji Restoration the tea room is said to have passed out of Naruse hands to the Oshima family. The Agency for Cultural Affairs records a relocation during the Meiji period, 1868 to 1912, which fits the account of a move from temple grounds to a private plot. The word used in the Japanese sources is a careful one: this is transmitted history, not documented sale.

It moved once more. In 1986 the building was shifted within the property by Hikiya, the technique of jacking a timber structure onto rollers and hauling it sideways with its frame intact rather than dismantling it. Small buildings survive this well, and at 43 square meters this one is very small.

Inside the four-and-a-half mats

The plan of the Oshima Family Tea House puts the tea room itself at the centre, with a mizuya preparation room and a narrow saya-no-ma antechamber ranged along its south side. The mizuya is where utensils are washed and the service is laid out, out of sight of the guests.

The ceiling is where the design argument happens. Over the host's mat, where tea is actually prepared, the ceiling drops one level and is finished as an Ajiro-tenjō, a panel of thin woven wood strips. Over the guests, the ceiling rises one level and is boarded with thin cedar shingles set between slender bamboo battens. Two ceilings, two heights, two materials, inside a room measuring four and a half mats. The Agency for Cultural Affairs describes the arrangement as being in the taste of Sen no Rikyu, the sixteenth-century tea master whose small, unshowy rooms set the standard that later builders quoted.

Outside, the roof is a simple Kirizuma-zukuri gable in pan-and-cover tiles. The whole is restrained Sukiya-zukuri, the domestic style that grew out of tea architecture and prizes slender members and plain surfaces over display.

Tea in a castle town

Inuyama has long grown tea, and by the Edo period the practice had settled well below the samurai class. Inuyama City's historic townscape plan cites an essay by Iwata Kinpei, founder of the Iwata Senshinkan foundation, describing a jobbing carpenter who whisked his own bowl of tea during the lunch break.

The Oshima family were not alone in keeping a tea room. The Kojima family, sake brewers, had one, and so did the Takagi family, who brewed under the shop name Watazen. What makes this building count is that it survives, dated, and legible.

That is also the basis of its heritage status. A single registration criterion was applied, that the building contributes to the historic landscape of the country, under register number 23-0365. Inuyama City has separately listed it as a structure forming the city's historic character under the Historic Townscape Law.

Registration is not designation. Introduced in 1996, it is the lighter of Japan's two systems for built heritage: owners keep using their buildings and may alter interiors, in exchange for a duty to notify before changing the exterior. For a small privately owned tea room, that is the workable arrangement.

Visiting

The Oshima Family Tea House is privately owned and normally closed. Because it sits behind the main house at the back of the plot, there is no vantage point from the street, not even of the roof. Turning up to look at it from outside is not an option here.

Inuyama City's historic townscape plan does record that the tea room is opened to the public once a year. The date is not fixed and is announced through city and tourism channels. Anyone travelling to Inuyama specifically to see it should contact the Historic Townscape Section of the Inuyama City Board of Education on 0568-44-0354 before booking. Entering the property outside an announced opening is not permitted.

The address is 21-1 Nishikoken, Inuyama City, one block west of Honmachi-dori. It lies about twelve minutes on foot from the west exit of Meitetsu Inuyama Station, or roughly 620 meters south of the entrance to Inuyama Castle, some eight minutes away.

If your dates do not line up with the annual opening and you want to stand inside a tea room in Inuyama, there is a year-round alternative about 600 meters to the northeast. Urakuen garden holds Joan, one of the most celebrated surviving tea rooms in Japan, and it operates as a visitor site with published hours.

Photography on the open day depends on the organisers, so follow the instructions given on the day. Visitor information here was checked on 30 August 2026.