A headman's farmhouse at Oyamazaki
The Iwase Family Residence Main House (岩瀬家住宅主屋, Iwase-ke Jūtaku Shuoku) is a large thatched farmhouse in the Oyamazaki district of Tsuchiura, Ibaraki Prefecture, built around 1858 (Ansei 5) and listed as a Registered Tangible Cultural Property in 2009.
The Iwase family served as nanushi, the headman who ran Oyamazaki village on behalf of the authorities, during the later Edo period. The house reflects that standing in plain numbers. It runs 26 meters along its long axis and 11 meters deep, with a floor area of 366 square meters, which sets it well above the ordinary run of farmhouses on this part of the Kanto plain.
The building faces south from roughly the middle of a walled compound. Its roof is Yosemune-zukuri, hipped on all four slopes, and was laid in Kayabuki thatch. Sheet copper now covers that thatch as a temporary skin, a holding measure many owners adopt while the cost and timing of a rethatch are worked out.
Two later rounds of work left their mark, one in the middle of the Meiji period and one in the middle of the Showa period. The Iwase Family Residence Main House is therefore a late Edo frame carrying a century and a half of adjustment, not a specimen frozen at the moment of construction.
Why the house was put on the register
The Iwase Family Residence Main House was the first of the family's buildings to be listed, in 2009. Another 7 followed in 2010 (Heisei 22): the household storehouse, the rice storehouse, the miso storehouse, the front gate, the middle gate, the east gate and the perimeter wall. Eight structures in all now hold Registered Tangible Cultural Property status.
The case for listing rests on scale and bearing rather than on any rare technique. A 366 square meter farmhouse under a hipped thatched roof is a substantial piece of timber framing, and the survival of the whole establishment around it matters as much as the house itself.
Gates, wall and storehouses all remain in place. Behind the house a row of storehouses fans outward, so the working geography of a headman's property, front approach, dwelling, and stores to the rear, can still be read on the ground. Farmhouses of this rank usually reach the present day stripped of their outbuildings, the gates sold or demolished and the storehouses replaced by garages. That is why the group was listed together rather than the house alone.
What to look for
Start with the roof of the Iwase Family Residence Main House. A hipped thatched roof of this span needs an enormous volume of material, and its four sloping planes meet in a short ridge rather than the long straight one a gabled roof would give. The copper sheeting laid over the thatch changes the color but not the shape, so the underlying form still reads clearly at a distance.
Then look at the proportions. At 26 meters by 11 meters the building is long and comparatively shallow, the standard shape for a Kanto farmhouse but stretched to an unusual length.
The third thing worth noticing takes a moment longer. Buildings on a farm compound are normally lined up square with each other. Here the storehouses behind the house are set at slightly different angles, splayed like the ribs of a fan, an arrangement that follows the shape of the plot rather than a drawing board.
Visiting the Iwase Family Residence Main House
The property is a private home and is not open to the public. There are no opening hours, no admission charge and no interior tours. Visitors must not enter the compound or the approach to it.
What faces the public road is the front gate and the wall running east and west from it. The Iwase Family Residence Main House stands deeper inside the plot, so anything seen from the road is partial and at a distance. Photography from the public road is a matter of ordinary courtesy: keep to the roadway, avoid pointing a camera into the grounds, and do not photograph residents.
Kandatsu Station on the JR Joban Line is the nearest railway stop, about 3 kilometers to the east. On foot that is roughly 40 minutes along roads with little shoulder, so a taxi from the station is the sensible option. Anyone wanting to know whether the buildings are being opened for a special event should contact the Cultural Properties Section of the Tsuchiura City Board of Education (029-826-1111, extension 5120) before travelling.
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Q&A
- Can I go inside the Iwase Family Residence Main House?
- No. The house remains a private residence and is not open to visitors. The compound is closed and there are no scheduled tours of the interior.
- When was the Iwase Family Residence Main House registered, and under what category?
- It was entered on the national register as a Registered Tangible Cultural Property in 2009. A further 7 buildings on the same property were registered in 2010, bringing the group to 8 structures.
- How big is the Iwase Family Residence Main House?
- It measures 26 meters along its long axis by 11 meters deep, with a floor area of 366 square meters. It is a single-storey timber building under a hipped thatched roof.
- How do I reach the Iwase Family Residence Main House from the nearest station?
- Kandatsu Station on the JR Joban Line lies about 3 kilometers away, roughly 40 minutes on foot. A taxi from the station is quicker and safer, as the roads have narrow shoulders.
- Is the roof of the Iwase Family Residence Main House still thatched?
- Yes, the thatch is still there. Sheet copper has been laid over it as a temporary covering, which protects the material while leaving the hipped shape of the roof visible.
Basic Information
| Name | Iwase Family Residence Main House |
|---|---|
| Location | 411-1 Michichi, Oyamazaki, Tsuchiura City, Ibaraki Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered in 2009 (Heisei 21) |
| Quantity | 1 building |
| Dimensions | 26 meters long, 11 meters deep, floor area 366 square meters |
| Owner | Private owner |
| Public Access | Not open to the public. Private residence, interior and grounds closed |
References
- National Cultural Properties Database, Agency for Cultural Affairs: Iwase Family Residence Main House
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00007448
- Ibaraki Prefectural Board of Education, Cultural Properties of Ibaraki: Iwase Family Residence Main House and seven other buildings
- https://kyoiku.pref.ibaraki.jp/bunkazai/bunkazai-registered-6043/
- Tsuchiura City: Cultural property explanatory panels and Cultural Properties Section contact
- https://www.city.tsuchiura.lg.jp/kanko-bunka-sports/rekishi-bunkazai-maizobunkazai/page013918.html
Last verified: 2026.09.05