A Timber Building Dressed as Masonry
The Former Yamaichi Hayashi-gumi Silk Filature Office (旧山一林組製糸事務所, Kyū Yamaichi Hayashi-gumi Seishi Jimusho) is a two-storey wooden office building at 1-13-17 Chūōchō, Okaya City, Nagano Prefecture, completed in 1921 and entered on Japan's register of Tangible Cultural Properties on 9 February 2005.
Approach it from the car park behind the Ilf Plaza shopping complex and the first impression is of reinforced concrete. Brown tile covers almost the whole façade. Pilasters rise the full height of both storeys in the manner of a giant order, finished in arai-dashi, a rendering technique in which the surface is washed while still green to expose the aggregate. Sash windows march along the front at even intervals. The plinth is faced in stone.
Then the roof gives it away. Hipped, covered in sangawara, the ordinary pantile of Japanese domestic building, with a gabled pediment breaking forward at the second-floor eaves. Underneath the tile skin the structure is timber throughout.
The frontage runs 24 metres, the depth 13, and the recorded building area is 316 square metres. A porte-cochère stands at the centre of the front, set slightly toward the west, where company cars once pulled up under cover.
The Company, the Strike, and the Case for Registration
Yamaichi Hayashi-gumi began operating in 1879 and grew into one of the five largest filatures in Okaya, a town whose raw silk output at its peak accounted for something close to a quarter of the national total. By 1927 the firm ran nine plants with 3,966 reeling basins between them, three in Okaya itself and the rest spread across Nagano, Saitama, Chiba, Shizuoka and Aichi, which placed it sixth in Japan by basin count.
That same year the building became the centre of a labour dispute remembered as the Yamaichi sōgi. Beginning on 28 August 1927 and lasting nineteen days, roughly 1,300 workers, most of them young women employed at the reeling machines, struck over pay and conditions. The company shut the plant and the dormitories. Police were deployed. The strike ended on 18 September in defeat for the workers, and it is generally counted the largest dispute in Japan's prewar silk-reeling industry. Photographs from the period show the strikers gathered at their headquarters in mourning dress.
The business itself did not last much longer under that name. It was reorganised as Hayashi-gumi Seishi in 1929, became Mihato Seishi in 1948, and in 1961 was renamed Shinei Kōgyō and turned to precision engineering before closing in 1972.
The Agency for Cultural Affairs registered the building as a surviving head-office structure of a filature company representative of Okaya. Registration is the lighter of Japan's two heritage systems, introduced in 1996 for modern buildings that fall outside the strict designation given to National Treasures and Important Cultural Properties, and this entry was made under the criterion of contributing to the historic landscape of the country. The gatehouse that stands beside the front gate, a single-storey weatherboarded structure of about 14 square metres built around the same year, was registered on the same day as a separate property. In 2007 both were included among the industrial modernisation heritage sites recognised by the national government.
Visiting: Looms Where the Ledgers Were
The building is owned by Okaya City and now houses Okaya Kinu Kōbō, a workshop where members weave Okaya silk by hand, develop new silk products and sell what they make. The ground floor, which the company used mainly as its general office, holds the looms.
The workshop opens on Tuesdays, Saturdays and Sundays and closes at four in the afternoon. Published opening times vary between nine and half past nine, so confirming before travelling is sensible. On those days the interior can be seen. Hands-on weaving is available for a fee and requires a reservation. Outside opening days the exterior can still be viewed and photographed from the adjoining car park at any time.
It is about an eight-minute walk from Okaya Station on the JR Chūō Main Line, and there is parking for a handful of cars.
Okaya recognises fifteen sites in its industrial modernisation heritage group, and several sit within walking distance. The Okaya Silk Museum, which keeps working reeling machinery in operation, explains the whole process the office once administered. The Former Hayashi Residence, home of the filature owner Hayashi Kunizō, is an Important Cultural Property known for the gilt-leather wallpaper in its detached wing. The former Okaya city hall of 1936, itself a registered property, was paid for by donations from the silk families.
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Q&A
- Can the interior of the Former Yamaichi Hayashi-gumi Silk Filature Office be visited?
- Yes, on the days the resident workshop opens. Okaya Kinu Kōbō occupies the ground floor and opens on Tuesdays, Saturdays and Sundays until four in the afternoon. Weaving sessions carry a charge and need to be booked in advance. On other days only the exterior can be seen.
- How do you reach the Former Yamaichi Hayashi-gumi Silk Filature Office?
- It stands at 1-13-17 Chūōchō in Okaya City, Nagano Prefecture, about eight minutes on foot from Okaya Station on the JR Chūō Main Line. The entrance is reached through the flat car park behind the Ilf Plaza complex, and a small number of parking spaces are available.
- Is the Former Yamaichi Hayashi-gumi Silk Filature Office built of brick?
- No. The frame is timber, two storeys, under a hipped roof of Japanese pantiles with some zinc-plated steel sheet. The masonry appearance comes from brick tile applied over the exterior, with rendered pilasters left proud of the tiled surface.
- What happened at the Former Yamaichi Hayashi-gumi Silk Filature Office in 1927?
- The Yamaichi strike. From 28 August to 18 September 1927, about 1,300 workers, mainly young women, stopped work over pay and conditions. The company closed the plant and dormitories, and the strike ended without the workers' demands being met. It is regarded as the largest labour dispute in Japan's prewar silk-reeling industry.
- When was the Former Yamaichi Hayashi-gumi Silk Filature Office registered as a cultural property?
- It was registered on 9 February 2005 and gazetted on 28 February, under registration number 20-0184. The adjacent gatehouse of about 1921 was registered separately on the same date.
Basic Information
| Name | Former Yamaichi Hayashi-gumi Silk Filature Office (旧山一林組製糸事務所) |
|---|---|
| Location | 1-13-17 Chūōchō, Okaya City, Nagano Prefecture |
| Designation | Registered Tangible Cultural Property (Structure), registration no. 20-0184 |
| Year Designated | Registered 9 February 2005 (gazetted 28 February 2005) |
| Quantity | 1 building |
| Dimensions | Two-storey timber structure; tiled roof partly in zinc-plated steel sheet; building area 316 m²; frontage 24 m, depth 13 m |
| Owner | Okaya City |
| Public Access | Interior open on the workshop's operating days (Tue, Sat, Sun until 16:00); weaving sessions by reservation and for a fee; exterior visible at any time |
References
- National Database of Designated Cultural Properties, Agency for Cultural Affairs: Former Yamaichi Hayashi-gumi Silk Filature Office
- https://kunishitei.bunka.go.jp/heritage/detail/101/00004540
- Cultural Heritage Online: Former Yamaichi Hayashi-gumi Silk Filature Office
- https://online.bunka.go.jp/heritages/detail/189270
- Cultural Heritage Online: Former Yamaichi Hayashi-gumi Filature Gatehouse
- https://online.bunka.go.jp/heritages/detail/141811
- Okaya City Tourism: Former Yamaichi Hayashi-gumi Office and Gatehouse
- https://kanko-okaya.jp/enjoy/heritage/旧山一林組製糸事務所・守衛所-2
- Suwa Tourism Federation: Industrial Heritage of Silk-Reeling Okaya
- https://www.suwa-tourism.jp/archives/000199.php
- Hachijuni Culture Foundation: Cultural Properties of Shinshu
- https://www.82bunka.or.jp/bunkazai/detail.php?no=5157&seq=0
Last verified: 2026.08.20