The Onaya: A Working Shed on the Eastern Boundary
Not every registered building was built to impress. The Onaya, the large shed of the former Hirayasu residence in Kawanishi, Hyogo Prefecture, was built to hold tools, sacks, carts, and whatever else a substantial household needed within reach. It runs along the eastern edge of the compound, part of the line of storehouses and sheds that closes the site off on that side, and it dates from the same building campaign as its neighbours, Taisho 7 to 8, or 1918 to 1919.
The floor area is 40 square meters, and the plan is unusual enough to be worth pausing over: what reads from outside as one long building is actually two independent structures joined together. The roof is a simple gable, tiled. Inside, the whole ground level is doma, packed earth, with no raised timber floor, and the southern room carries a chunikai, a low mezzanine tucked under the roof for storage.
The walls are shinkabe construction, meaning the structural posts stay visible on the surface with plaster filling the panels between them. This is the opposite of what the storehouses across the yard do, where thick plaster is carried over the frame to seal it against fire. The difference is not carelessness. Fireproofing costs money and was spent where the valuables were. A shed for equipment got a frame you can see and read.
Why an Ordinary Building Was Registered
The Agency for Cultural Affairs record describes the Onaya as a standard shed of the Taisho period, plain in construction and closed in its outward manner. That assessment is not faint praise, and understanding why requires knowing what the register is for.
The Onaya was entered in the national register on 7 May 1997, notified on 29 May, under number 28-0012. Its ground for registration is recorded as a work establishing a standard of form. Registered Tangible Cultural Property status came into being with a 1996 amendment to the Law for the Protection of Cultural Properties, at a point when buildings of the Meiji, Taisho, and early Showa periods were disappearing faster than anyone could catalogue them. Unlike designation as an Important Cultural Property, which is reserved for a small number of exceptional buildings and controls alteration tightly, registration works by notification and is meant to keep buildings standing and in use.
Under that framework, being typical is the qualification. Grand houses of the period survive in reasonable numbers because grandeur attracts protection. The plain service buildings that made those houses function tend to be demolished first, which is exactly why an intact shed of 1918 has documentary value. Fifteen structures of the former Hirayasu residence carry the status together, and the Onaya is one of the pieces that lets the whole arrangement be understood as a working household rather than a preserved facade.
Reading the Layout
Stand in the yard and look east. The compound was organized in two rings. Four storehouses, the detached rooms, and the bathhouse sit around an inner courtyard; beyond them, on the outer edge, the rice storehouse and the sheds line up north to south. The Onaya belongs to the outer ring, and its closed exterior faces outward, giving the site a defined boundary.
Two joined structures under one roofline produce a subtle break in the elevation. Look for the change in rhythm along the wall, and for the way the mezzanine at the southern end registers in the framing. The earthen floor inside would have taken barrows and loaded baskets straight from the yard, which is why there is no step up at the entrance.
The house this served belonged to a family of copper smelters. The Hirayasu ran the last smelting works of the Tada silver and copper mining district, building a modernized plant northeast of the residence during the Taisho period and operating it until around 1935. Excavation has shown it comprised a blast furnace, a mabuki refining hearth, a blower shed, and a chimney, though the final refining stage still used the early modern hearth method. The slope behind the old house is where that plant stood.
Practical Notes for a Visit
Kawanishi City Museum of Local History opened in the former Hirayasu residence in November 1988. The grounds also hold the Hiraga house, a British-influenced country villa relocated from the Ogo district, the Musee Espoir art museum, and the Atelier Hiratsu. The Hirayasu buildings closed in October 2023 for seismic strengthening and reopened to visitors on 12 October 2024.
Opening is Thursday through Sunday, 10:00 to 16:30, with last admission at 16:00. Admission is 300 yen for those over 18 and 150 yen for 18 and under, with reductions for older residents and visitors with disabilities. Thirteen parking spaces are available. From Yamashita Station on the Nose Electric Railway the walk takes about fifteen minutes.
The interiors of the sheds and storehouses are not on the visitor route, so plan on viewing the Onaya from outside. Give yourself time to walk the full length of the eastern range instead of photographing a single building and moving on. The sequence is the point.
- 📍 Plan Your Visit to Hyogo
- Find tours, activities & transport passes near Kawanishi City Local Museum (Former Heian Family Residence
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Q&A
- What is an onaya?
- A naya is a shed or barn for tools, produce, and equipment. O means large, so the name distinguishes this building from the smaller sheds elsewhere on the same grounds, which are named for their positions: north, south, and west.
- Why does the record say it is two buildings when it counts as one?
- Structurally it consists of two independent frames built against each other and joined. For registration purposes it is treated as a single unit, which is why the official quantity is one building.
- What is the difference between shinkabe and the walls of the storehouses?
- In shinkabe the structural posts remain exposed on the wall surface. The storehouses use thick plaster carried across the frame to resist fire, which hides the timber entirely. The choice reflects what each building was protecting.
- Can I photograph the buildings?
- Photography of the exteriors from the grounds is normally fine. Rules can differ for the exhibition rooms and for tripods or commercial use, so check at the reception desk when you arrive.
- Is there anything about the copper smelting on display?
- Yes. A mining materials room inside the main house exhibits tools used at the Hirayasu smelter along with finds from excavations on the site, including bellows from the Meiji-period works.
Basic Information
| Name | Kawanishi City Museum of Local History (Former Hirayasu Residence, Onaya Shed) |
|---|---|
| Category | Registered Tangible Cultural Property (Buildings) |
| Registration number | 28-0012 |
| Registered | 7 May 1997 (notified 29 May 1997) |
| Criterion | A work establishing a standard of form |
| Date of construction | Taisho 7 to 8 (1918 to 1919) |
| Quantity | 1 building |
| Structure | Wooden, single storey with mezzanine at the south end, tiled roof; floor area 40 square meters |
| Type | Residence / building |
| Address | 4-1 Shimozai-cho, Kawanishi City, Hyogo Prefecture |
| Owner | Kawanishi City |
| Opening hours | 10:00 to 16:30 (last admission 16:00) |
| Closed | Monday, Tuesday and Wednesday (open on national holidays); 28 December to 4 January |
| Admission | Over 18: 300 yen; 18 and under: 150 yen |
| Access | About 15 minutes on foot from Yamashita Station, Nose Electric Railway |
| Telephone | 072-794-3354 |
References
- National Database of Designated Cultural Properties, Agency for Cultural Affairs: Kawanishi City Museum of Local History (Former Hirayasu Residence, Onaya)
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00000148
- Kawanishi City: Museum of Local History
- https://www.city.kawanishi.hyogo.jp/shiseijoho/shokai/kankouannai/1003058/kankou_kyodo.html
- Kawanishi City: Facilities of the Museum of Local History
- https://www.city.kawanishi.hyogo.jp/shiseijoho/shokai/kankouannai/1003058/kyodokan_syosai.html
- Cultural Heritage Online: Kawanishi City Museum of Local History (Former Hirayasu Residence, Main House)
- https://online.bunka.go.jp/heritages/detail/135848
- Kawanishi City: Change to opening days from 1 April 2026
- https://www.city.kawanishi.hyogo.jp/kurashi/shimin/sports/1009251/1023735.html
Last verified: 2026.07.22