Craftsmanship in a Service Wing
The Covered Passage and Bathroom of the former Ōnishi Residence (旧大西家住宅（みとろ苑）渡廊下及び浴室, also written Kyū Ōnishi-ke Jūtaku Mitoro-en Watari-rōka oyobi Yokushitsu) is a single-storey timber structure in the Mitoro (見土呂) district of Kakogawa City, Hyōgo Prefecture, dating from the Taishō era and listed as a Registered Tangible Cultural Property on 28 April 2009. It runs southeast from the great hall of the Mitoro-en estate, turning at a right angle partway along, with the bathroom and its associated rooms attached on the north side.
The floor area comes to 50 square metres. The roof is a kirizuma gable, partly laid with sangawara pantiles and partly sheathed in copper, the two materials meeting where the plan changes direction. Walls are earthen plaster throughout.
The framing member that gives the wing its character is migaki-maruta, polished log timber. These are trunks left round rather than squared, their bark removed and the surface worked smooth so that the natural taper and irregularity of the wood stay visible. Using them is a deliberate signal. Squared posts belong to formal architecture; round polished ones belong to the sukiya idiom that grew out of the tea house, where refinement is expressed through restraint and through materials that look as though they were chosen individually.
The Agency for Cultural Affairs describes the result as an elegant building in a sukiya-influenced manner. That phrasing is worth pausing on, because the subject is a bathroom and a corridor.
Where the Wing Sits in the Estate
Mitoro-en began as a country villa. The Ōnishi family built it on the right bank of the Kako River, and in 1918 the ninth head of the house, Ōnishi Jin'ichibei, added a great hall and a newly made garden to what was already there. The name Mitoro-en dates from that expansion.
What resulted was a compound in several parts rather than a single house. The garden alone comprises the south garden of the earlier main house, then the north, south and east gardens laid out around the new hall, and the approach garden of the tea room joined to its western gable. Water descends from two falls on an artificial hill, splitting between a real stream and a dry bed of set stones and gravel, and finally reaches the pond in the south garden. A second tea room, called the Akashi Room, is said to have been moved here from Akashi Castle during the Meiji era, though that account is a tradition rather than a documented transfer. The garden was listed on its own as a Registered Monument in 2007, two years ahead of the buildings.
Within that arrangement, the covered passage is the connector. It carries people from the formal rooms of the hall toward the bath, along a route that changes direction once, and its walls and windows are what a guest saw during the walk. That is a modest brief, and it was met with unusual care.
The wing was registered under the criterion for contributing to the historic character of the landscape, registration number 28-0392, in the 63rd round announced on 14 May 2009. The same criterion applies to the estate's front gate, while the great hall was listed under the stricter heading reserved for buildings that serve as a model of design.
Windows, Ribs and a Boat-Hull Ceiling
Two window shapes cut the earthen walls. One is a square opening with its corners clipped off, an octagonal outline that reads as a square from a distance and softens as you approach. The other is a mokkō window, named after the melon-section crest motif, a rounded lobed form that has been part of the Japanese decorative vocabulary since the medieval period. Neither shape is structurally necessary. Both do the work that windows do in sukiya buildings, which is to place a specific frame around a specific view and to admit light in a shape you notice.
The bathroom ceiling is the detail most worth travelling for. A ventilation opening sits at the centre, and from it saobuchi ceiling ribs radiate outward like the spokes of a fan. Ceiling ribs are normally laid parallel, running one direction across a room; setting them radially requires each piece to be cut to a different angle at both ends, and the joint at the centre has to resolve every one of those angles at once. The steam of a bath rises to the middle and leaves through the vent, so the pattern also does a job.
Next door, the changing room has a funazoko ceiling, an inverted boat-hull form with the surfaces sloping up from the walls to a flat ridge. It is a shape usually reserved for tea rooms and small studies. Putting one above a bench where guests undressed says a good deal about the standard the household set for itself.
Access needs planning. Mitoro-en is private property owned by the Rural Culture Association, and the bathroom wing is not open to the public on any regular basis. There is no admission fee, no reception desk and no published opening hours. Parts of the estate have at times been used as a garden restaurant, so what a visitor could see has varied with the owner's business rather than with any heritage scheme, and it should not be assumed that any interior is currently accessible. Anyone hoping to see the wing should arrange it in advance; Kakogawa City's Cultural Properties Research Centre (079-423-4088) can advise. Photography inside depends on the owner's permission. The front gate, by contrast, can be viewed from the public lane without arrangement.
The site lies roughly two kilometres from Yakujin Station on the JR Kakogawa Line, about thirty minutes on foot or ten by taxi, and the Kamishō Kururin-gō community bus serves the district. Drivers should allow about fifteen minutes from the Miki-Ono interchange of the Sanyō Expressway or from the Kakogawa exit of the Kako River bypass. Local lanes are narrow, and the city asks visitors to follow the signed approach.
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Q&A
- Can the Covered Passage and Bathroom of the former Ōnishi Residence be visited?
- Not on a regular basis. The wing stands on private land owned by the Rural Culture Association, with no published opening hours, no admission fee and no visitor reception. Arrange any visit in advance, or contact Kakogawa City's Cultural Properties Research Centre on 079-423-4088 for current information.
- What is distinctive about the ceiling of the Covered Passage and Bathroom of the former Ōnishi Residence?
- The bathroom has a ventilation opening at the centre of its ceiling with saobuchi ribs radiating outward from it, rather than the usual parallel arrangement. The adjoining changing room has a funazoko ceiling, an inverted boat-hull shape more often found in tea rooms.
- How large is the Covered Passage and Bathroom of the former Ōnishi Residence, and when was it built?
- It is a single-storey timber structure of 50 square metres, counted as one building, roofed in tile and copper sheet. The Agency for Cultural Affairs dates it to the Taishō era, between 1912 and 1925.
- How does the Covered Passage and Bathroom of the former Ōnishi Residence connect to the rest of Mitoro-en?
- It extends southeast from the great hall, turning at a right angle along its length, with the bathroom and related rooms attached on the north side. The great hall and the estate's front gate were registered on the same day in April 2009.
- What are the window shapes in the Covered Passage and Bathroom of the former Ōnishi Residence?
- Two kinds are cut into the earthen walls: square openings with clipped corners, and mokkō windows with a rounded lobed outline drawn from a traditional crest motif. Both belong to the sukiya vocabulary of the tea house.
Basic Information
| Name | Covered Passage and Bathroom, former Ōnishi Residence (Mitoro-en) / 旧大西家住宅（みとろ苑）渡廊下及び浴室 |
|---|---|
| Location | 375-1 Aza-O, Mitoro, Kamishō-chō, Kakogawa City, Hyōgo Prefecture |
| Designation | Registered Tangible Cultural Property (Structure), registration number 28-0392; criterion: contribution to the historic landscape |
| Year Designated | Registered 28 April 2009; announced 14 May 2009 (63rd round) |
| Quantity | 1 building |
| Dimensions | Single-storey timber frame, tile and copper-sheet roof, floor area 50 m² |
| Owner | Rural Culture Association (財団法人農村文化協会) |
| Public Access | No regular public opening; enquire with the owner or Kakogawa City in advance |
References
- Agency for Cultural Affairs, National Cultural Properties Database - Covered Passage and Bathroom, former Ōnishi Residence (Mitoro-en)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00007656
- Cultural Heritage Online - Covered Passage and Bathroom, former Ōnishi Residence (Mitoro-en)
- https://online.bunka.go.jp/heritages/detail/143418
- Kakogawa City - Former Ōnishi Residence (Mitoro-en), three registered structures
- https://www.city.kakogawa.lg.jp/soshikikarasagasu/kyouiku/kakuka/kyoikushidobu/bunkazai_cyosa/bunkazai/kunitourokukaisetu/kunitourokukyuuoonisikejuutakumitoroenkaisetu.html
- Cultural Heritage Online - Mitoro-en Garden
- https://online.bunka.go.jp/heritages/detail/212190
Last verified: 2026.08.05