A Salt Merchant's House of 1916
Matsugaya Main House (松賀屋主屋, Matsugaya Omoya) is a two-storey timber residence in Nio, Mitoyo City, Kagawa Prefecture, completed in 1916 (Taishō 5) and entered on Japan's national register of Tangible Cultural Properties on 31 October 2022. It occupies the centre of a compound of roughly 2,770 square metres that belonged to the Shiota family, merchants whose head bore the inherited name Chūzaemon.
The family began with soy sauce and tea. Shipping followed, and then salt, which is what made them wealthy. Nio sits on the western shore of the Mitoyo plain, facing the Seto Inland Sea, with long hours of sun and shallow tidal flats: conditions that suited the evaporation ponds worked here for generations. The Agency for Cultural Affairs describes this building plainly as the shop and dwelling of the merchant house that opened the Nio salt fields.
Salt paid for the timber. It also paid for the carpenter, and that turns out to matter more than it sounds.
Mitoyo City has noted that the master carpenter who led the work was a miyadaiku, a specialist in shrine and temple construction rather than in houses. Techniques that belong to religious architecture surface throughout the building, applied to rooms meant for sleeping, eating and doing business.
Why the House Was Registered
Japan's registration system for Tangible Cultural Properties, introduced in 1996, works differently from designation as an Important Cultural Property. Registration is lighter in touch: owners keep considerable freedom to use and alter their buildings, and the state offers advice and limited support in exchange for a commitment to preservation. Three criteria exist, and a property needs only one.
Matsugaya Main House was registered under the first of them, as a work that serves as a model of design. Its registration number is 37-0466, issued in the 103rd round of registrations, and both the public notice and the entry itself are dated 31 October 2022. Two neighbouring structures on the same plot, the entrance wing and the storehouse, were registered on the same day under a different criterion, the one concerning contribution to the historic character of the landscape.
Three separate registrations, one household. The distinction reflects what each building does: the main house is judged on the quality of its making, the other two on how they meet the street.
Reading the Plan
The building covers about 190 square metres at ground level, under a hipped-and-gabled roof clad in hon-gawara tiles, the heavy pan-and-cover system used on temples and on the houses of people who could afford it.
An earth-floored passage, the doma, runs along the southern side. Its western half was the kitchen. North of the doma, on the raised timber floor, three rooms sit in a row on the east side and three more on the west, with a veranda wrapping around the outside of both groups.
What sets the plan apart is the staircase. Rather than tucking it into a corner, the carpenter placed it at the centre of the building and arranged the upper-floor tatami rooms around it. The Agency for Cultural Affairs calls this arrangement distinctive, and it is: most merchant houses of the period treat the upper floor as storage or servants' quarters reached by a steep ladder-stair at the edge of the plan. Here the second floor was clearly meant to be lived in.
Look up when you reach it. The rafters in the roof space fan outward from a point, the arrangement known as ōgi-daruki, which Japanese carpenters developed for Zen temple halls and almost never used in domestic buildings. Mitoyo City singled out this ceiling when the registration was announced to the press in July 2022.
Details Worth Slowing Down For
The joinery repays close attention. Transom carvings, the panelling below the shōji, the ceiling boards of the ground-floor reception room: visitors who have been inside describe paulownia wood used consistently through that space, a choice that speaks of a client with settled tastes and the means to indulge them.
Along the garden side, the veranda turns a corner without a post. Leaving out the corner column is a small structural boast and a large change in how the room feels, since nothing interrupts the view from the tatami to the garden.
The stair handrail carries a pine carving, a play on the house name. Matsugaya is written with the character for pine, and by local account the name goes back to the pine needles once burned under the pans to boil down brine, though that explanation is passed on rather than documented.
Anyone comparing the buildings should also step outside to the street front, where the entrance wing and the storehouse give the compound its public face, and note the downpipe beside the entrance: it is shaped as Ebisu, the god of fishermen and of commercial luck.
Planning a Visit
Matsugaya is a private property, cared for by the general incorporated association that carries its name. It is not a museum with fixed opening hours. Free public open days are held from time to time and are announced on the association's website and on its Instagram and Facebook accounts, so check those before travelling.
Rooms were also available to rent for workshops, photography and small events, at 5,000 yen plus tax for a three-hour slot. That service has been suspended since February 2026 while maintenance work is carried out, with no restart date announced at the time of writing. Repairs to roof tiles and plaster have been an ongoing concern for the association, which took over from a predecessor body founded after a local townscape group formed in 2013 to bring the long-empty house back into use.
By car, the compound is about 15 minutes from the Sanuki-Toyonaka interchange on the Takamatsu Expressway, and five free parking spaces are provided. By train, take the JR Yosan Line to Takuma Station, then a Mitoyo City community bus on the Nio Line, which runs Monday to Saturday excluding public holidays at a flat fare of 100 yen per ride. Services are infrequent; a taxi from Takuma Station takes roughly 12 to 15 minutes. The postal address is 769-1407 Kagawa-ken, Mitoyo-shi, Nio-chō, Nio, Kita-chō 980.
Chichibugahama, the tidal beach known across Japan for its mirror-like sunset reflections, is a few minutes away by car on the same coast, which makes a late-afternoon pairing easy to arrange.
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Q&A
- Is Matsugaya Main House open to the public, and is there an admission fee?
- There are no regular opening hours. The managing association holds free open days on an irregular schedule and announces them through its website and social media accounts. Confirm the date before you travel, since the house is otherwise a private property.
- When was Matsugaya Main House built, and what is its heritage status?
- It was built in 1916, the fifth year of the Taishō era, and was entered on the national register of Tangible Cultural Properties on 31 October 2022 under registration number 37-0466. Registration is a lighter-touch category than designation as an Important Cultural Property.
- How do I get to Matsugaya Main House from JR Takuma Station?
- Mitoyo City community buses on the Nio Line connect Takuma Station with central Nio, running Monday to Saturday except public holidays for a flat 100 yen. Departures are sparse, so check the timetable; a taxi covers the same distance in about 12 to 15 minutes. Five free parking spaces are available for drivers.
- Can I take photographs inside Matsugaya Main House?
- The rooms have been used for portrait and costume photography under the paid rental scheme, so photography is not prohibited in principle. Conditions on open days are set by the managing association, and asking staff on arrival is the reliable approach.
- What can I see near Matsugaya Main House in Nio?
- The same compound holds the registered entrance wing and storehouse, both visible from the street. Nio's old quarter keeps buildings from the Edo period through the Shōwa era, including a rice vinegar brewery working since the mid-Edo period, and Chichibugahama beach lies a short drive west.
Basic Information
| Name | Matsugaya Main House (松賀屋主屋) |
|---|---|
| Location | 980 Kita-chō, Nio, Nio-chō, Mitoyo City, Kagawa Prefecture |
| Designation | Registered Tangible Cultural Property (Structure), registration no. 37-0466; criterion: model of design |
| Year Designated | 31 October 2022 (Reiwa 4) |
| Quantity | 1 building |
| Dimensions | Timber, two storeys, tiled roof; building area approx. 190 m² |
| Owner | Matsugaya General Incorporated Association |
| Public Access | Irregular free open days announced by the managing association; rental use suspended since February 2026 for maintenance |
References
- 国指定文化財等データベース — 松賀屋主屋
- https://kunishitei.bunka.go.jp/heritage/detail/101/00014415
- 一般社団法人松賀屋 — 松賀屋と仁尾
- https://www.nio-matsugaya.com/blank-1
- 一般社団法人松賀屋 — お問合せ・アクセス
- https://www.nio-matsugaya.com/blank-4
- 三豊市 — 歴史を感じる市内の家屋が国の登録有形文化財に
- https://www.city.mitoyo.lg.jp/hotnews_old/reiwa4/202207hot/9908.html
- 仁尾興産株式会社 — 会社案内
- https://www.navio.ne.jp/company/
- 三豊市 — コミュニティバス 時刻表・路線図
- https://www.city.mitoyo.lg.jp/kakuka/seisaku/koutsuu/1_1/11655.html
Last verified: 2026.08.09