The Former Aikawa Detention Branch Office Building
The Former Aikawa Detention Branch Office Building, in Aikawa Shingorocho in Sado City, Niigata Prefecture, is a single-storey timber office block built in 1954 and listed as a Registered Tangible Cultural Property in 2006.
It faces the gate on the northeast side of the plot and was the first building anyone entering the facility met. The block measures 13 metres along the ridge and 9 metres deep, with a floor area of 112 square metres. The roof is hipped, or Yosemune-zukuri, entered from the eaves side in the manner called Hirairi, and covered with pantiles known as Sangawara-buki. Mortar render runs up the walls to the underside of the eaves, and there is almost no ornament around the windows.
A corridor leads west to the kitchen and storehouse. The Former Aikawa Detention Branch Office Building was never a free-standing structure but the entrance to a chain of buildings running deeper into the site.
Why It Was Listed
The Former Aikawa Detention Branch Office Building was listed because its plan states its purpose so plainly. Its register number is 15-0204, and the listing criterion is the contribution it makes to the historical landscape of the country.
The roof frame deserves attention as well. Instead of a Japanese-style frame, the builders used timber trusses, the common choice in post-war government construction, to span the 9 metre depth. The exterior gives nothing away, yet the carpentry above the ceiling records the standard practice of the day.
Complete timber detention facilities rarely survive in Japan. Within this one, the Former Aikawa Detention Branch Office Building shows how the working side of the institution, the side staffed rather than confined, was put together.
A Plan Divided at the Entrance
Inside the Former Aikawa Detention Branch Office Building the entrance hall splits the plan in two. West of it lie the interview room, the waiting room, the examination room and the property store, all of them used for business involving the people held here. Their floors are mortar-finished Doma, meant to be crossed in outdoor shoes.
East of the entrance are the general office, the branch head's room, the night duty room, the orderly's room and the hot water room, given over to running the place. Apart from the cooking area, those floors are boarded or laid with Tatami. One side was walked on in shoes, the other in socks, and in the Former Aikawa Detention Branch Office Building that distinction survives in the floor finishes.
The property store held belongings taken from people on arrival. Read the sequence from the waiting room through the interview room to the examination room and the order of the procedure becomes clear.
Visiting the Former Aikawa Detention Branch Office Building
Admission to the Former Aikawa Detention Branch Office Building is free, interiors included. Nobody is on duty to guide you, so the rooms are yours to walk through. Compare the floors as you step in from the entrance hall: the point where the finish changes is the point of the whole building.
The exterior can be seen from outside the gate. Stand between the gate posts and the hipped roof and the front entrance line up squarely. No official guidance on photography has been published, so ask the World Heritage Division of Sado City at Kirarium Sado (0259-74-2215) if that matters to your plans.
Directions to the site and the way opening hours are handled apply to the whole facility and are set out on the page for the Former Aikawa Detention Branch. This building alone takes only a short visit, though the corridor on its west side carries on to the kitchen and storehouse and the cell building.
Q&A
- Can I go inside the Former Aikawa Detention Branch Office Building, and is there a charge?
- You can go inside, and there is no charge. No guide is on duty, so visitors walk through the rooms on their own. Opening hours and closed days are not published, so call the World Heritage Division of Sado City at Kirarium Sado (0259-74-2215) before you set out.
- What rooms does the Former Aikawa Detention Branch Office Building contain?
- West of the entrance are the interview room, waiting room, examination room and property store. East of it are the general office, the branch head's room, the night duty room, the orderly's room and the hot water room. The west side dealt with the people held here; the east side ran the institution.
- When was the Former Aikawa Detention Branch Office Building built, and how long was it used?
- It was built in 1954 as the office block of the Aikawa branch of Niigata Prison and stayed in use until 1972, when the facility moved to the Sawata district. That is a working life of 18 years.
- Is the interior of the Former Aikawa Detention Branch Office Building still in its original state?
- The partitions and floor finishes remain as they were. The mortar floor on the west side and the boards and tatami on the east side are both intact, so the use of each room can still be read from the plan.
- May I take photographs at the Former Aikawa Detention Branch Office Building?
- No official guidance on photography has been published. For tripods or any commercial shoot, and for ordinary snapshots if you would rather be certain, ask the World Heritage Division of Sado City at Kirarium Sado (0259-74-2215).
Basic Information
| Name | Former Aikawa Detention Branch Office Building |
|---|---|
| Location | 24 Aikawa Shingorocho, Sado City, Niigata Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered in 2006 (Heisei 18) |
| Quantity | 1 building |
| Dimensions | 13 metres along the ridge, 9 metres deep, floor area 112 square metres |
| Owner | Sado City |
| Public Access | Interior open, free of charge, hours not published |
References
- Agency for Cultural Affairs, National Cultural Properties Database: Former Aikawa Detention Branch Office Building
- https://kunishitei.bunka.go.jp/heritage/detail/101/00005781
- Cultural Heritage Online: Former Aikawa Detention Branch Office Building
- https://online.bunka.go.jp/heritages/detail/196779
- Sado City: Registered Tangible Cultural Property, Former Aikawa Detention Branch
- https://www.city.sado.niigata.jp/site/bunkazai/4959.html
- Sado Tourism Navi: Former Aikawa Detention Branch
- https://www.visitsado.com/spot/detail0101/
Last verified: 2026.09.14
