A Single Room Built Around Its Own Light
The Exhibition Hall of the Kan-onji City Museum of Local History (観音寺市郷土資料館展示館, also written Kan'onji-shi Kyōdo Shiryōkan Tenjikan), built in 1914 as part of the Mitoyo County Agricultural Association Experiment Station (旧三豊郡農会農事試験場), is a single-storey wooden hall in Ariake-cho, Kan-onji City, Kagawa Prefecture, registered as a national Registered Tangible Cultural Property on 2 September 1998.
It stands behind the two-storey main building of the same complex and is joined to it by a covered corridor, which the registration record treats as part of the structure. Building area is about 146 square metres, half again as large as the main building in front of it, and all of that area is one undivided room.
An agricultural association in Taishō-period Kagawa needed floor space of a particular kind. Seed trials, soil samples, grafting stock and drying racks all want to be laid out flat and looked at closely, which means the room has to be wide, uninterrupted by columns, and lit from above rather than only from windows in the walls. The Exhibition Hall was built to those requirements, and the requirements are still legible in the roof.
The Roof Is the Argument
From outside, the hall reads as a hipped tile roof with something extra riding on its back. That extra element is a koshiyane, a monitor roof raised along the centre of the main slope with its own small roof and a band of openings beneath. It exists to bring daylight down into the middle of a deep room, where wall windows cannot reach.
Inside, nothing is hidden. The ceiling is open to the rafters and the framing of the roof is left exposed: a Western king-post truss, not a traditional Japanese assembly of stacked beams. Trusses of this type were among the clearest imports of the Meiji and Taishō building trades, because they let a carpenter span a wide room with less timber and no interior posts.
The detail that makes the hall worth a specific trip sits in the frame supporting the monitor roof. The struts beneath the beams there, the hōzue, are not the plain straight members the structure would function perfectly well with. They are cut as reverse-curved timbers, bowing where a straight brace would run flat. The Agency for Cultural Affairs record calls this an accent, and that reading is fair: someone decided that the one part of the building most people would look at deserved a shape rather than merely a section.
It is a small decision, and it says a good deal about how Western structural technique was absorbed here. The truss came in as engineering. By the time it reached a county farm office in Sanuki, a carpenter was treating the visible parts of it as something to be composed.
Registration, and What Has Happened Since
The hall was registered in the eleventh round of the national register with the announcement of 25 September 1998, carrying registration number 37-0016, one number after the main building. Both were entered under the criterion that the structure serves as a model of design, and both remain in the ownership of Kan-onji City.
The complex has changed function repeatedly. After the experiment station closed, the buildings served as an industrial promotion hall, then housed the Sanuki Museum from 1926, then a municipal library alongside it, and from June 1980 the Kan-onji Municipal Museum of Local History. The Exhibition Hall took its present name during that last phase, when the single room proved useful for the same reason it had been built: a wide, well-lit floor where objects can be set out and walked around.
The museum closed in March 2018 and its collections are now shown at the Furusato Gakugeikan in Onohara-cho, a former primary school building. Since the closure, the Exhibition Hall has not been in regular public use, so anyone travelling specifically to see the interior should contact Kan-onji City in advance rather than assume access.
Seeing It from Outside
The exterior repays a visit even without entry. Walk around the main building to the rear and the covered corridor comes into view, running low between the two structures. From a few metres back the monitor roof lifts clear of the main slope, and the profile of a hipped tile roof carrying a second smaller roof along its ridge is unusual enough in a Japanese townscape to stop the eye.
The front building, meanwhile, is open. Its ground floor now operates as Kotohiki Café from 9:00 to 17:00, closed over the New Year period, with enquiries handled through the Coin Museum of the World on 0875-23-0055. Coffee in the front building and a look at the hall behind it makes a coherent half-hour.
The grounds form part of Kotohiki Park, a national Place of Scenic Beauty whose pine woods run down to Ariake Beach and whose Zenigata sunae, a vast coin raked into the sand, is viewed from the hillside above. JR Kan-onji Station is about twenty minutes away on foot; the city's noriai community bus will also set passengers down near the park entrance on request.
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Q&A
- Can visitors see inside the Exhibition Hall of the Kan-onji City Museum of Local History?
- Not on a walk-in basis. Since the museum closed in March 2018 the hall has not been in regular public use. The exterior and the covered corridor linking it to the main building can be seen from the grounds at any time; for interior access, enquire with Kan-onji City in advance.
- What makes the Exhibition Hall of the Kan-onji City Museum of Local History architecturally significant?
- Its roof structure. A monitor roof is raised along the centre of the hipped roof to light the interior from above, and the single undivided room below shows an exposed Western king-post truss. The struts under the beams of the monitor frame are cut as reverse-curved timbers rather than straight members.
- How does the Exhibition Hall of the Kan-onji City Museum of Local History relate to the Main Building?
- They were built together in 1914 for the same agricultural experiment station and are joined by a covered corridor, with the Exhibition Hall standing to the rear. They were registered separately on the same day, as numbers 37-0016 and 37-0015 respectively.
- Where can I see the collections that were once displayed in the Exhibition Hall of the Kan-onji City Museum of Local History?
- At the Furusato Gakugeikan at 313 Marui, Onohara-cho, Kan-onji City, housed in a former primary school. It opens 9:00 to 17:00 with last admission at 16:30, closes on Mondays, and charges no admission.
- Is there parking near the Exhibition Hall of the Kan-onji City Museum of Local History?
- Yes. The site adjoins the Michi-no-Eki Kotohiki roadside station, which has visitor parking, and the Coin Museum of the World and Ohira Masayoshi Memorial Hall are in the same cluster of buildings.
Basic Information
| Name | Exhibition Hall, Kan-onji City Museum of Local History (former Mitoyo County Agricultural Association Experiment Station) |
|---|---|
| Location | 3-55 Ariake-cho, Kan-onji City, Kagawa Prefecture |
| Designation | Registered Tangible Cultural Property (Structure); criterion: a model of design |
| Year Designated | Registered 2 September 1998, announced 25 September 1998 (registration no. 37-0016) |
| Quantity | 1 building |
| Dimensions | Wooden, single storey with attached covered corridor, tiled roof; building area approx. 146 m² |
| Owner | Kan-onji City |
| Public Access | Not in regular public use since 2018; exterior viewable from the grounds. Enquiries: Kan-onji City Cultural Promotion Division, 0875-23-3943 |
References
- National Cultural Properties Database, Agency for Cultural Affairs — Exhibition Hall, Kan-onji City Museum of Local History
- https://kunishitei.bunka.go.jp/heritage/detail/101/00000712
- Cultural Heritage Online — Exhibition Hall, Kan-onji City Museum of Local History
- https://bunka.nii.ac.jp/heritages/detail/166022
- Kan-onji City — Furusato Gakugeikan
- https://www.city.kanonji.kagawa.jp/soshiki/30/12133.html
- Kan-onji City — Cultural Promotion Division
- https://www.city.kanonji.kagawa.jp/soshiki/30/
- Michi-no-Eki Kotohiki — Kotohiki Café
- https://michinoeki-kotohiki.com/store/pass
- Kan-onji City Tourism Association — Furusato Gakugeikan
- https://kanonji-kanko.jp/furusato-gakugeikan/
Last verified: 2026.08.09