Nagashiki Family Residence Main House: A Farmhouse That Learned to Receive Guests
Two roofs sit on one building. Approach the Nagashiki main house from the southwest and the western third rises under a hipped-and-gabled roof of heavy formal tiles, with lean-to eaves wrapped around three sides so that the profile reads almost like shikoro-buki, the layered "neck-guard" roof shape borrowed from temple carpentry. The eastern portion is plainer: a straightforward gable under lighter pantiles. The seam between those two roofs is where this house tells you what happened to it.
The building stands on a hill in the northern part of Kōnoshima, a district of Kasaoka City in Okayama Prefecture. It is a single-storey structure with its ridge running east to west, timber-framed, tiled, and covering 65 square metres. Japan's Agency for Cultural Affairs dates the fabric to the closing decades of the Edo period, roughly 1830 to 1868, with early Taishō-era work and a repair carried out in 1974.
Kōnoshima was an island then. The Kasaoka Bay land reclamation project, begun in December 1966 and finished in March 1990, filled the shallows and turned the island into a peninsula. Before that, the sea lay directly below this hillside. The Nagashiki family served as shōya, village headmen, for Kōnoshima Uchiura from the late Edo period onward, and their money came from kaisen coastal shipping and from developing salt fields. A stone lantern in the grounds carries an inscription dated Tenpō 2 (1831), which suggests a household was established here no later than that year.
Why the Building Was Registered
On 6 March 2024 the main house entered the national register as a Registered Tangible Cultural Property (Building), number 33-0358, in the 106th round of registrations. Its two companion structures on the same site, the storehouse and the inner gate, were registered on the same day.
Registration is not designation, and the difference matters. Japan's older system of shitei designation produces National Treasures and Important Cultural Properties: a small, tightly protected group where almost any alteration requires official permission. The registration system, added to the Law for the Protection of Cultural Properties in 1996, works the other way round. It casts a wide net over buildings roughly fifty years old or more, asks only for notification rather than permission when owners make changes, and exists precisely so that ordinary structures can stay in ordinary use while still being recognised. Some fourteen thousand buildings across the country carry the status.
The criterion applied here was the first of the three available: a building contributing to the historic landscape of the nation. Assessors singled out the quality of the carpentry against the standard of a rural headman's house. The Agency's own summary calls it a main house of superior construction, pointing to details like the doubled eaves facing the south garden.
What gives the house its interest is not a single moment of construction but a sequence of them. Kasaoka City's cultural properties office notes that the original building carried the marks of a farmhouse: an earthen-floored doma, a thatched roof. The tiles came during the Taishō era, along with additions and rebuilding. Yet pillars, a thick sashi-kamoi lintel, and portions of the beams survive from the Edo-period frame, enough that the earlier plan can still be read out of the standing structure.
What to Look For
Inside, three rooms run in a line from west to east. The easternmost is the formal zashiki, fitted with a full toko-gamae: an alcove, a built-in writing bay called tsuke-shoin, and the flanking tokowaki shelving. This is the eight-mat room that appears in the Agency's photographic record, and it is the part of the house Kasaoka City singles out as exceptional. The guest parlour was put together during the Taishō period, using roof forms drawn from shrine and temple building and choice timbers in the alcove. A family of headmen was not simply housing itself here. It was preparing a room for people who had to be received properly.
Local accounts hold that lords of Fukuyama Castle and the district magistrate were entertained in this residence, and the guest room is said to have been known as the onari no ma, the chamber for an august visit. The claim rests on local tradition rather than on the Agency's record, so treat it as the neighbourhood remembers it rather than as documented fact.
Step back outside and look up at the eaves along the south garden front. They are built futanoki, with two tiers of rafters rather than one. It is a small thing. It is also expensive, and it does not appear on farmhouses.
The ridge tiles reward a second glance too. Okayama Prefecture's account draws attention to the patterned tiles along the main ridge, and the same motif reappears on the roof of the storehouse to the south, which suggests both roofs were reworked as one campaign.
Visiting takes planning. The Nagashiki house is a private residence and is not open to the public in the normal course of things. The grounds can be seen during events held on the site, among them a handmade soba gathering, and dates are announced through the "長鋪邸" Facebook page. Toilets and parking are available only when an event is running. By car the house is about thirteen minutes from JR Kasaoka Station and about nineteen minutes from the Kasaoka interchange on the Sanyō Expressway. Anyone unable to time a visit to an event will still find the reclaimed bay below worth the drive, since the flat green expanse spread beneath the hill is the sea this family once made its living from.
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Q&A
- Can I go inside the main house?
- Not as a rule. It is a private home and is not on a regular public schedule. Access to the grounds opens during events staged at the property, with dates announced on the "長鋪邸" Facebook page.
- How is a Registered Tangible Cultural Property different from an Important Cultural Property?
- Registration, introduced in 1996, is the lighter of the two frameworks. Owners notify the authorities of changes instead of applying for permission, and the aim is to keep buildings alive and in use. Important Cultural Properties belong to the older designation system, which protects a far smaller group under much stricter controls.
- How old is the building exactly?
- The Agency for Cultural Affairs gives the range 1830 to 1868 for the original construction, describing the fabric as late Edo with early Taishō work and a 1974 repair. No precise build year is documented. The stone lantern in the grounds, inscribed with the year 1831, is the firmest dated object on the site.
- Why does part of the roof look like temple architecture?
- Because the carpenters intended it to. The western section carries a hipped-and-gabled roof with lean-to eaves on three sides, giving a layered shikoro effect, and Kasaoka City's account links the guest parlour built in the Taishō era to roof forms taken from shrine and temple work. The vocabulary was chosen to raise the register of the reception rooms.
- Are the storehouse and gate part of the same visit?
- Yes. The storehouse stands south of the main house and the inner gate southwest of the formal room, all within the same walled compound, and all three were registered together on 6 March 2024. They read as one composition rather than three separate monuments.
Basic Information
| Name | Nagashiki-ke Jūtaku Omoya (Nagashiki Family Residence Main House) |
|---|---|
| Category | Registered Tangible Cultural Property (Building) |
| Registration number | 33-0358 (106th round of registration) |
| Date of registration | 6 March 2024 |
| Registration criterion | Contributing to the historic landscape of the nation |
| Period | Edo period, 1830-1868; early Taishō work; repaired 1974 |
| Structure | Timber frame, single storey, tiled roof; floor area 65 square metres |
| Quantity | 1 building |
| Location | 3042 Aza-Shirukata, Kōnoshima, Kasaoka City, Okayama Prefecture |
| Owner | Private individual |
| Public access | Not normally open. Grounds accessible during events held on site; dates announced via the "長鋪邸" Facebook page. Toilets and parking available during events only. |
| Access | About 13 minutes by car from JR Kasaoka Station; about 19 minutes from Kasaoka IC, Sanyō Expressway |
References
- National Database of Cultural Properties, Agency for Cultural Affairs: Nagashiki-ke Jūtaku Omoya
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00014937
- Cultural Heritage Online: Nagashiki-ke Jūtaku Omoya
- https://online.bunka.go.jp/heritages/detail/531287
- Kasaoka City: Registered Tangible Cultural Property (Building), Nagashiki Family Residence
- https://www.city.kasaoka.okayama.jp/soshiki/39/61907.html
- Okayama Prefecture: Nagashiki Family Residence Main House, Storehouse and Inner Gate
- https://www.pref.okayama.jp/uploaded/attachment/383950.pdf
Last verified: 2026.07.15