Open data: private onsen dataset
Our compiled private-bath facts for 219 properties are free to download and reuse under CC BY 4.0.
Can I reuse the Private Onsen Finder data?
Yes. Our dataset of 219 verified properties lists in-room baths, kashikiri baths, fees, booking rules, spring water and tattoo policies, each with its official source URL and verification date. It is free to reuse under CC BY 4.0 with attribution to Private Onsen Finder (privateonsen.jp).
Last verified · How we verify · Open data
Downloads
- private-onsen.json (full structure, with a source URL for every fact)
- private-onsen.csv (one row per property)
What's included?
For each property: English and Japanese names, onsen town, prefecture, official website, source type, verification date, links to our pages in all three languages, OpenStreetMap and Wikidata links, and the facts below, each with its official source URL.
| Field | Meaning | Values |
|---|---|---|
inroom | Rooms with their own open-air bath | "all" (every room) or "some" (some room types) |
inroom_count | Number of rooms with an open-air bath, where stated | number |
kashikiri | Private (kashikiri) baths one group locks and uses | "yes" or "no" |
kashikiri_count | Number of kashikiri baths, where stated | number |
kashikiri_fee | Kashikiri fee for staying guests | "free", "paid" or "paid ¥amount" |
kashikiri_booking | How kashikiri slots work | "reservation", "first-come" or "on-arrival" |
kakenagashi | Free-flowing spring water (源泉かけ流し) mentioned | true |
heated | Treatment noted for some baths | Japanese term, e.g. 加温 |
tattoo_private | Tattoos allowed in private baths | "yes" |
tattoo_public | Tattoos in shared baths | "yes" or "no" |
tattoo_cover | Cover-sticker rule mentioned | true |
kids | Children accepted | "yes" or "no" |
room_dining | In-room dining on some plans | "yes" or "no" |
view_fuji | Mt Fuji view mentioned | true |
view_sea | Sea view mentioned | true |
dayuse_private | Day-use private bath mentioned | true |
Summary by onsen town
| Onsen town | Prefecture | Verified | In-room open-air bath | Kashikiri baths | Free kashikiri | Last verified |
|---|---|---|---|---|---|---|
| Hakone | Kanagawa | 22 | 18 | 17 | 1 | 18 October 2026 |
| Lake Kawaguchiko | Yamanashi | 15 | 10 | 13 | 0 | 18 October 2026 |
| West Izu (Toi, Heda & Dogashima) | Shizuoka | 7 | 5 | 4 | 3 | 18 October 2026 |
| Atami | Shizuoka | 11 | 9 | 8 | 2 | 17 October 2026 |
| Ito | Shizuoka | 3 | 1 | 3 | 1 | 17 October 2026 |
| Shuzenji | Shizuoka | 7 | 3 | 5 | 2 | 17 October 2026 |
| Kusatsu | Gunma | 17 | 7 | 16 | 5 | 17 October 2026 |
| Nikko & Kinugawa | Tochigi | 9 | 6 | 6 | 1 | 17 October 2026 |
| Kinosaki | Hyogo | 49 | 6 | 47 | 11 | 17 October 2026 |
| Arima | Hyogo | 10 | 9 | 8 | 0 | 17 October 2026 |
| Kyoto (Arashiyama, Ohara & Kurama) | Kyoto | 3 | 1 | 3 | 0 | 17 October 2026 |
| Gero | Gifu | 15 | 10 | 14 | 0 | 17 October 2026 |
| Takayama & Okuhida | Gifu | 6 | 3 | 5 | 2 | 17 October 2026 |
| Kurokawa | Kumamoto | 5 | 0 | 5 | 0 | 17 October 2026 |
| Yufuin | Oita | 8 | 4 | 8 | 1 | 17 October 2026 |
| Beppu | Oita | 16 | 10 | 13 | 1 | 17 October 2026 |
| Ginzan | Yamagata | 5 | 0 | 5 | 1 | 17 October 2026 |
| Noboribetsu | Hokkaido | 3 | 2 | 2 | 0 | 17 October 2026 |
| Jozankei | Hokkaido | 3 | 1 | 3 | 0 | 17 October 2026 |
Licence
Our compiled private-bath facts are available under CC BY 4.0: you may use, share and adapt them, including commercially, as long as you credit us. The dataset contains no coordinates; use the OpenStreetMap links for locations (OpenStreetMap data is available under the ODbL). We don't publish text or photos copied from websites, and Rakuten Travel data is not included.
How to cite
Private Onsen Finder (privateonsen.jp), data verified 18 October 2026. URL: https://privateonsen.jp/data/
Updates
The dataset is regenerated every time the site is updated; the current data was last verified on 18 October 2026. Inclusion rules and field definitions are on our methodology page.