The Main House in the Tanigawa Woods
Among the trees at Tanigawa Onsen stands the former convalescent quarters now known as Reitaku-kan. It is a single-storey gabled house with a bathhouse joined onto its east end, so that living space and bath read as one long, low form under the trees. As at Ōana, the roof is cedar bark laid over cedar bark, a double thatch that gives the building its shaggy, deliberate texture. Inside, two connected tatami rooms of 12.5 and 7.5 mats open into each other, with a tokonoma alcove set into the west wall and a ceiling of cedar bark held by split-bamboo battens. At about 94 square metres, it is the largest of the four Minakami structures registered together in 2025.
Its full name is Hiroike Chikuro Tanigawa Kinenkan Reitaku-kan (former main house and bath). The building went up in 1936 and was repaired in the late 1960s to early 1970s. This was where Hiroike Chikuro stayed and worked during his time in the Tanigawa mountains.
A Scholar's House, and a Name That Endured
Hiroike Chikuro reached these mountains after a long scholarly career. Largely self-taught, he contributed to the vast national encyclopaedia Koji Ruien, lectured at Waseda, and in 1912 earned a doctorate of law from Tokyo Imperial University for work in East Asian legal history, a field he did much to open. His later years turned to the moral study he named Moralogy, and to the schools and foundation that carried it forward. Those schools still bear the name Reitaku, which recurs across his life, and the same two characters name this house in the woods.
The main house was registered as a Tangible Cultural Property on 13 March 2025, under the criterion of contributing to the historic landscape. What is preserved is not a grand villa but a working retreat: rooms to rest and think in, a bath drawing on the local spring, all built plainly from mountain cedar. Grouped with the shrine beside it and the Ōana buildings across town, it anchors the site where the scholar spent his final years.
What to Look For
Inside, the connected 12.5- and 7.5-mat rooms show how a modest house was arranged for both rest and study, with the tokonoma on the west wall marking the formal focus of the space. The ceiling repays a glance upward: cedar bark under split-bamboo battens, the same handmade surface that runs through every building on the two sites.
Outside, notice where the bath joins the house at the east end, a reminder that the whole retreat was organised around taking the waters. The house sits among trees, and the quiet is part of the experience. The Tanigawa and Ōana memorial centres are free to enter and open in general from 7:00 to 16:00, with irregular closing days; a preservation committee formed in 2022 has been recording and repairing the buildings, so some details may change between visits. Confirm hours before driving up.
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Q&A
- What does "Reitaku" mean here?
- Reitaku is a name that recurs across Hiroike Chikuro's life and is still carried by the schools connected to his foundation. The same two characters name this former main house.
- What was the building used for?
- It served as convalescent quarters and living space during Hiroike's time at Tanigawa, with a bathhouse attached on the east side drawing on the local hot spring.
- How large is it?
- About 94 square metres, the largest of the four Minakami structures registered in 2025. Inside are connected rooms of 12.5 and 7.5 tatami mats.
- Who was Hiroike Chikuro?
- A scholar of East Asian legal history who earned a doctorate of law in 1912 and later proposed the moral study he called Moralogy. He spent his final years convalescing in these mountains.
- Can I visit?
- Yes, as part of the Tanigawa Memorial Center. Entry is free; hours are generally 7:00 to 16:00 with irregular closures, so confirm ahead.
Basic Information
| Name | Hiroike Chikuro Tanigawa Kinenkan Reitaku-kan (former main house and bath) |
|---|---|
| Location | 557-1 and adjacent, Uehara, Tanigawa, Minakami, Tone District, Gunma Prefecture |
| Category | Registered Tangible Cultural Property (structure); registered 13 March 2025 |
| Registration No. | 10-0359 |
| Built / Repaired | 1936; repaired late 1960s–early 1970s |
| Structure | Wood, single storey, cedar-bark roof; floor area about 94 m²; one building |
| Owner | Moralogy Institute for Moral Education |
| Access | Free entry; generally open 7:00–16:00, irregular closing days |
References
- National Database of Cultural Properties (Agency for Cultural Affairs) — Tanigawa Kinenkan Reitaku-kan
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00015285
- Cultural Heritage Online — Tanigawa Kinenkan Reitaku-kan
- https://online.bunka.go.jp/heritages/detail/622419
- Moralogy Institute for Moral Education — notice of registration
- https://www.moralogy.jp/post-44265/
- Moralogy Institute for Moral Education — advisory report on registration
- https://www.moralogy.jp/post-43868/
Last verified: 2026.07.04