A Western-style building still on the payroll
The Ehime Silkworm Seed Co., Ltd. Office and Entrance is a two-storey Western-style timber building in the Kawanoishi district of Honai, Yawatahama City, Ehime Prefecture, put up in the late Meiji period and listed as a Registered Tangible Cultural Property on 7 June 1999. Its Japanese name is 愛媛蚕種株式会社事務室・玄関, read Ehime Sanshu Kabushiki-gaisha Jimushitsu Genkan. The walls are timber finished in render, the roof is sheet metal with slate in part, and the floor area is about 209 square meters.
The most striking thing about it is not the style or the age. It is that the building still works. Silkworm eggs, the product the Japanese call sanshu, are still produced on this site, and the entrance is still the door that staff and customers use. This is not a preserved interior. It is the face of a functioning workplace.
A kimono merchant who went into eggs
The business dates from 1884, when Hyodo Toraichiro, a dealer in kimono fabric in Kawanoishi, moved into producing silkworm eggs under the shop name Fumotoya. That enterprise later took the name Nisshinkan. Raw silk and silk goods were becoming one of Japan's principal exports, and egg supply sat at the head of that chain: the quality of a silk region depended on it.
Toraichiro pushed the technical side. In 1906, drawing on inspection trips around the country, he worked out a method of refrigerating silkworm eggs, the first attempt in Ehime and reportedly the third anywhere in Japan, using an ice house packed with natural ice on Mount Joshin in what was then the town of Nagahama. Chilling let him control when the eggs hatched. A large ice store went up on the company's own site in 1913, replaced by electric refrigeration from 1961. By 1912 the firm ranked seventh in Japan by shipment value among producers of silkworm eggs.
The company reorganised as a limited partnership in 1905 and as a joint-stock company in 1919, when the rearing halls were built. After a wartime consolidation dissolved it, the business restarted in 1946 under its present name. The Ehime Silkworm Seed Co., Ltd. Office and Entrance has stood at the head of that site through most of those hundred and forty years.
The entrance sits on a cut corner
The plot is long and narrow on a north-south axis. The Ehime Silkworm Seed Co., Ltd. Office and Entrance occupies its south-eastern end, with the rearing halls running north from the back of it. As factory planning goes, the logic is plain: administration faces the street, production extends behind.
What repays a look is where the door is. The south-eastern corner of the building is cut away on the diagonal, and the entrance is set into that chamfer. Approach along either of the two streets and you arrive at the front. Urban commercial buildings of the period used the device often; provincial industrial buildings rarely bothered. A shallow porch projects above the door.
Rendered over its timber frame, the elevation carries a triangular pediment above each of the ground-floor windows, giving every opening its own small gable and the whole street face a steady beat. The roof is sheet metal and slate rather than tile, another sign that this was conceived as an industrial building of the late Meiji years rather than a house dressed up for show.
Where the listing sits
The registration took effect on 7 June 1999 and was gazetted on 19 July that year. Agency for Cultural Affairs records give the registration number as 38-0004, from the 17th round of listings, under the criterion that the building contributes to the historic landscape of the nation.
The first and second rearing halls to the north were listed on the same day, each as a separate Registered Tangible Cultural Property. According to material published by the Honai volunteer guide association, this group was the fourth listing in Ehime Prefecture and the first there in private ownership. Registers tend to fill up with public buildings first; here a working company put its name forward early.
The same association describes the firm as the only remaining producer of silkworm eggs in western Japan. Because production continued, a building with a dull job to do survived with its working character intact rather than as a stage set.
Visiting
The Ehime Silkworm Seed Co., Ltd. Office and Entrance is part of a private company's operating premises and is not open to the public. It does not appear on the list of cultural properties that Yawatahama City opens for public viewing, and the interior cannot be visited freely. Visitors should take care not to interfere with the owner's business.
The exterior can be seen from the adjoining streets, and the pediments and the chamfered entrance read clearly from the pavement. Keep photography to exterior shots taken from public ground; entering the site or photographing inside requires the owner's permission.
Anyone who would rather walk the area with an explanation can contact the Honai volunteer guide association, based at the Minase community facility in Kawanoishi, which runs guided walks by advance booking. What a guide can show depends on arrangements with the owner, so enquire ahead.
From JR Yawatahama Station, take a bus toward Ikata or Misaki and head for Kawanoishi, or drive, which takes about ten minutes. Yawatahama Port is also close by.
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Q&A
- Can visitors go inside the Ehime Silkworm Seed Co., Ltd. Office and Entrance?
- No. The building is the working office of a private company and is not open to the public, and it does not appear on Yawatahama City's list of cultural properties opened for public viewing. The exterior can be seen from the adjoining streets. Entering the site or photographing the interior requires the owner's permission.
- What is the heritage status of the Ehime Silkworm Seed Co., Ltd. Office and Entrance?
- It is a Registered Tangible Cultural Property in the buildings category, listed on 7 June 1999 and gazetted on 19 July that year, with registration number 38-0004 from the 17th round of listings. The criterion applied was its contribution to the historic landscape of the nation.
- What is worth looking at from outside the Ehime Silkworm Seed Co., Ltd. Office and Entrance?
- The entrance, which is set into a diagonal cut across the building's south-eastern corner so that it faces both streets at once. A shallow porch projects above it, triangular pediments sit above each ground-floor window, and the timber walls are finished in render.
- How do you reach the Ehime Silkworm Seed Co., Ltd. Office and Entrance?
- Take a bus from JR Yawatahama Station toward Ikata or Misaki and get off for Kawanoishi, or drive, which takes about ten minutes. Yawatahama Port is nearby. The Honai volunteer guide association at the Minase community facility runs guided walks in the district by advance booking.
- What are the silkworm eggs that give the Ehime Silkworm Seed Co., Ltd. Office and Entrance its name?
- Sanshu means the eggs of the silkworm moth, supplied to farms that raise the larvae. Their quality governs the cocoons and the raw silk that follow. The company that built this office devised a way to refrigerate those eggs in 1906 using natural ice, which let it control hatching times and steady its supply.
Basic Information
| Name | Ehime Silkworm Seed Co., Ltd. Office and Entrance (愛媛蚕種株式会社事務室・玄関) |
|---|---|
| Location | 3-70 Kawanoishi, Honaicho, Yawatahama City, Ehime Prefecture |
| Designation | Registered Tangible Cultural Property (buildings) |
| Year Designated | Registered 7 June 1999 |
| Quantity | 1 building |
| Dimensions | 2-storey timber, sheet metal roof with slate in part, floor area about 209 square meters |
| Owner | Ehime Silkworm Seed Co., Ltd. |
| Public Access | Not open to the public. The building is a private company's working office; exterior viewing from the street only |
References
- National Cultural Properties Database, Agency for Cultural Affairs: Ehime Silkworm Seed Co., Ltd. Office and Entrance
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00001145
- Cultural Heritage Online: Ehime Silkworm Seed Co., Ltd. Office and Entrance
- https://bunka.nii.ac.jp/heritages/detail/147755
- Yawatahama City: About cultural properties, including which are opened to the public
- https://www.city.yawatahama.ehime.jp/doc/2022103100010/
- Yawatahama City: list of Registered Tangible Cultural Properties (PDF)
- https://www.city.yawatahama.ehime.jp/doc/2022103100010/file_contents/2022103100010_docs_2014091600054_files_touroku.pdf
- Honai Volunteer Guide Association: introduction to Honai and its industrial history
- https://www.honaimachinami.com/town-introduction/
Last verified: 2026.09.04