The Main House and Its Pressing Room
The Mitani Seito Hane Sanuki Honpo Main House (Oshiba), written 三谷製糖羽根さぬき本舗主屋(押し場) in Japanese, is the main house of a wasanbon sugar works in Umayado, Higashikagawa City, Kagawa Prefecture, built in the Taisho period (1912–1925), and was registered as a Registered Tangible Cultural Property (structure) on August 21, 2002 (Agency for Cultural Affairs).
The Agency records a Taisho-period building enlarged around 1950, a two-storey timber structure with a tile roof and a building area of 190 square metres; registration number 37-0127.
Oshiba means "pressing room": according to the Agency, it is the middle of the ground floor, where balance-shaped presses stand in a row. The owner, a wasanbon maker that gives its founding date as 1804, explains that kneaded raw sugar is set in presses called oshibune so that the molasses drains out slowly. The oshiba is where that step takes place.
Set Back from the Old Road
The Mitani Seito Hane Sanuki Honpo Main House (Oshiba) stands below the Osaka Pass on the old border between the provinces of Awa and Sanuki, near a river mouth, on a plot set back from the Asan Kaido (阿讃街道), the road that linked the two provinces (Agency for Cultural Affairs).
The ridge runs north to south under a gabled roof, and the building rises 2 storeys. A lean-to along the east side makes that front read like a house with a low upper floor of the kind called tsushi-nikai. Toward the south the building drops to a single storey and the roof becomes a hip-and-gable (Agency for Cultural Affairs).
The Agency record does not say which part dates from the enlargement of around 1950.
Why It Was Registered
The registration criterion is that the building contributes to the historic landscape of Japan (Agency for Cultural Affairs). The Mitani Seito Hane Sanuki Honpo Main House (Oshiba) is 1 of 3 buildings on the site registered on the same day, with the sugar boiling house and the former cowshed, and together they keep the layout of a wasanbon workshop.
What to Look For
On the outside of the Mitani Seito Hane Sanuki Honpo Main House (Oshiba), look at the low eaves formed by the lean-to on the east side, with the upper wall showing above them. Further south the roof changes from gable to hip-and-gable and the building drops to a single storey (after the Agency's description).
The sugar boiling house is attached just south of the entrance to the oshiba. Its smoke vent and brick chimney mark where the main house ends (Agency for Cultural Affairs).
Visiting
The Mitani Seito Hane Sanuki Honpo Main House (Oshiba) stands on the premises of a maker that still produces wasanbon. No official information was found on interior access, tours or photography. The shop on the premises is open to customers; directions and opening hours are on the Mitani Seito Hane Sanuki Honpo page.
Q&A
- What does "Oshiba" mean in the name of the Mitani Seito Hane Sanuki Honpo Main House (Oshiba)?
- It means pressing room. The Agency for Cultural Affairs describes it as the middle of the ground floor, lined with balance-shaped presses.
- When was the Mitani Seito Hane Sanuki Honpo Main House (Oshiba) built?
- In the Taisho period (1912–1925), with an enlargement around 1950 (Agency for Cultural Affairs).
- Can visitors go inside the Mitani Seito Hane Sanuki Honpo Main House (Oshiba)?
- No official information on interior access or tours was found. Check with Mitani Seito Hane Sanuki Honpo before visiting.
- Where is the Mitani Seito Hane Sanuki Honpo Main House (Oshiba)?
- At 156-5 Umayado, Higashikagawa City, Kagawa Prefecture (Agency for Cultural Affairs). The owner gives Aioi, that is Sanuki-Aioi Station on the JR Kotoku Line, as the nearest station.
- When was the Mitani Seito Hane Sanuki Honpo Main House (Oshiba) registered?
- On August 21, 2002 (Agency for Cultural Affairs).
Basic Information
| Name | Mitani Seito Hane Sanuki Honpo Main House (Oshiba) / 三谷製糖羽根さぬき本舗主屋(押し場) |
|---|---|
| Location | 156-5 Umayado, Higashikagawa City, Kagawa Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered 2002/08/21 (Heisei 14) |
| Quantity | 1 building |
| Dimensions | Timber, 2 storeys, tile roof, building area 190 m² |
| Owner | Mitani Seito Hane Sanuki Honpo |
| Public Access | No official information on interior access (the on-site shop is open) |
References
- Mitani Seito Hane Sanuki Honpo Main House (Oshiba) (Database of National Cultural Properties, Agency for Cultural Affairs, Japanese)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00003002
- Mitani Seito Hane Sanuki Honpo Main House (Oshiba) (Cultural Heritage Online, Japanese)
- https://online.bunka.go.jp/heritages/detail/168312
- Registered Tangible Cultural Properties in Kagawa Prefecture (Kagawa Prefectural Board of Education, Japanese)
- https://www.pref.kagawa.lg.jp/kenkyoui/shogaigakushu/bunkazai/culturalassets/culturalassets_16.html
- List of Cultural Properties in Higashikagawa City (Higashikagawa City, Japanese)
- https://www.higashikagawa.jp/soshikikarasagasu/shogaigakushuka/gyomuannai/8/1/1085.html
- Our Commitment (Mitani Seito Hane Sanuki Honpo, Japanese)
- https://www.wasanbon.com/free/mitaniseitoukodawari
Last verified: 2026.11.12