A merchant house of 1859 in Okazaki
The Former Ishihara Family Main Building (旧石原家住宅主屋, Kyū Ishihara-ke Jūtaku Shuoku) is a merchant house of 1859 in Rokukocho, Okazaki, Aichi Prefecture, registered by the national government as a Registered Tangible Cultural Property on 25 July 2011.
It occupies a corner plot and faces north. The frontage runs 18 metres, the depth 9.1 metres, and the building covers 163 square metres. A broad gabled roof of sangawara pantiles tops the whole, with lean-to eaves wrapping the ground floor on the south, north and east. The Agency for Cultural Affairs records it under registration number 23-0338, part of the seventieth round of registrations.
Stand on the pavement and your eye goes first to the ōdo, the wide sliding door that closes off the earth-floored passage inside. Heavy lattice and a projecting lattice bay run to either side of it. This is the standard face of a machiya, a Japanese townhouse, presented to the street.
Who the Ishihara were
The Ishihara dealt in rice and in money lending. Through the Edo period the head of the house served as shōya, the headman of Rokuku Sugimoto village, and after the Meiji Restoration of 1868 as its kochō, or district chief. Okazaki City's heritage notes call the survival of a village headman's residence inside a modern city centre an uncommon thing. The Former Ishihara Family Main Building is that residence.
The house was raised in 1859, in the last decade of Tokugawa rule. According to the family record published by the present owner, it was built by Ishihara Tōjūrō, then head of the house, who traded in firewood and charcoal as well as rice and is said to have kept company with court nobles in Kyoto. The same record describes something unusual about the plan: although the family were merchants, the interior follows farmhouse practice rather than pure townhouse practice.
In the Shōwa era a daughter of the house, Ishihara Aiko, taught music at nearby schools and gave piano lessons here. Around 1975 later alterations were stripped away and the interior returned to something close to its original state. For a time the building housed a restaurant serving reconstructed Edo-period dishes, then a folk craft shop, then a café.
Why it was registered
The Former Ishihara Family Main Building was registered under the criterion of contributing to the historic landscape of the country. The storehouse and the garden gate in the same grounds were registered on the same day, so the three structures were assessed together as a single household compound. In August 2013 Okazaki City gave the house a further municipal status, Important Landscape Structure, under the Landscape Act.
What makes the plan worth protecting is the way two ways of living sit inside one building. An earth-floored corridor runs along the eastern side. West of it, six rooms are arranged in two rows of three, and at the far western end come the Buddhist altar room and the formal reception room. The street elevation is a townhouse; the room layout behind it borrows from farmhouses. The family's dual identity, village official and grain merchant, is legible in the floor plan.
Sources disagree on one point. The structural field in the Agency for Cultural Affairs database records a single-storey timber building, while the commentary in that same database and the city's own description both give a low upper floor. The building is best understood as tsushi-nikai: a half-height storey tucked under the roof, used for storage and low enough that you cannot stand upright in it.
What to look at
The street front
Three elements sit in a row across the north face: the wide door, the heavy lattice, the projecting bay. The lattice bars are set close together, which lets those inside watch the street while keeping the interior dim and private from outside. In a house that handled rice and cash, this was a working barrier rather than ornament. On the gable ends the walls are finished in thick lime plaster with horizontal boarding applied over the lower part, where rain strikes hardest.
From earth floor to tatami
Step through the wide door and the earth floor runs back into the building. Goods came in this way, people passed through it, and fires were lit off it. The rooms rise to the west in two ranks, ending at the altar room and the reception room. The further in you go, the finer the finish and the higher the status of the guest expected there. Walking the sequence tells you how the household worked.
Repairs, visible and recent
This is a building kept alive by repair. In 2014 the tile roof was relaid for the first time in 160 years. The concrete apron around the base was repaired in 2018 and 2019. In 2025 damage caused by a vehicle collision on the street front was corrected using hikiya, a technique that pulls a distorted timber frame back into true; that work finished in early November. Inside, dark specks on a board door facing the courtyard are remembered in the family as marks left by incendiary bombs during the war.
Visiting
The house remains a private inheritance and is closed for most of the year. Once each autumn, when registered properties across Aichi Prefecture open together for the Aichi Architecture Expo, the owner runs her own event and the interior can be seen. In 2025 that fell on 8 November, under the title Yorubun, and the building stayed open from midday into the evening.
The date changes annually. The owner's website is usually updated around September, so check it before fixing autumn travel plans. In some years free viewing is combined with guided commentary by the owner or by architectural historians, offered by reservation with a capped number of places. Admission charges and refreshments vary from year to year.
The nearest station is Higashi-Okazaki on the Meitetsu Nagoya Main Line. From there the Former Ishihara Family Main Building lies about 1.1 kilometres north, roughly a fifteen-minute walk. Okazaki Castle Park sits about one kilometre to the west, so the two can be linked on foot through the old castle town. Parking arrangements depend on the event and should be checked in advance.
Photography is permitted or restricted at the owner's discretion on each open day; ask on arrival, or use the contact form on the official site beforehand. Outside open days the grounds are a working private home, so view the exterior from the public road and go no further.
- 📍 Plan Your Visit to Aichi
- Find tours, activities & transport passes near Former Ishihara Family Main Building
- [ Nagoya Castle & Atsuta Shrine History Tours ]
Q&A
- Can you visit the Former Ishihara Family Main Building, and when is it open?
- It is normally closed. The interior opens roughly once a year, in autumn, when the owner holds an event tied to the Aichi Architecture Expo. In 2025 the date was 8 November. Dates change each year, so check the owner's official website.
- How do you get to the Former Ishihara Family Main Building from the nearest station?
- Walk about 1.1 kilometres north from Higashi-Okazaki Station on the Meitetsu Nagoya Main Line, around fifteen minutes. The address is 70 Sugimoto, Rokukocho, Okazaki. Okazaki Castle Park is about one kilometre to the west.
- When was the Former Ishihara Family Main Building built, and by whom?
- It dates from 1859. The owner's published family record attributes it to Ishihara Tōjūrō, head of the house at the time. Modernising alterations were carried out in 1965 and 1978.
- What heritage status does the Ishihara house hold?
- It was entered on the national register of Registered Tangible Cultural Properties on 25 July 2011, under registration number 23-0338, for contributing to the historic landscape. Okazaki City added a municipal Important Landscape Structure designation in 2013.
- Is photography allowed at the Ishihara house?
- The owner decides on each open day and will say so on arrival. Ask through the contact form on the official site if you need to know in advance. On any other day the property is a private residence, so photograph the exterior from the road only.
Basic Information
| Name | Former Ishihara Family Main Building |
|---|---|
| Location | 70 Sugimoto, Rokukocho, Okazaki City, Aichi Prefecture |
| Designation | Registered Tangible Cultural Property (structure) |
| Year Designated | Heisei 23 (2011) |
| Quantity | 1 building |
| Dimensions | Frontage 18 metres, depth 9.1 metres, building area 163 square metres |
| Owner | Ishihara Ltd. |
| Public Access | Not normally open; admitted only on the special open day held each autumn |
References
- Agency for Cultural Affairs, National Cultural Properties Database: Kyu Ishihara-ke Jutaku Shuoku
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00008701
- Cultural Heritage Online: Kyu Ishihara-ke Jutaku Shuoku
- https://online.bunka.go.jp/heritages/detail/213742
- Okazaki City: Registered Structures, Former Ishihara Family Residence Main House, Storehouse and Garden Gate
- https://www.city.okazaki.lg.jp/bunka/torikumi_bunka/1004568/1004592/1004595/1004613.html
- Aichi Prefecture Cultural Property Navigator: Kyu Ishihara-ke Jutaku Shuoku
- https://jmapps.ne.jp/aichi_bunkazai/det.html?data_id=2150
- Official site of the owner: Registered Tangible Cultural Property, the Former Ishihara Residence
- https://www.orieotsuji.com/%E6%97%A7%E7%9F%B3%E5%8E%9F%E5%AE%B6%E4%BD%8F%E5%AE%85/
Last verified: 2026.08.30