Kasugai Onsen
- Location
- Kofu, Yamanashi, Japon, Japan
- Water type
- thermal
- Temperature
- 40 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Kasugai Onsen in Fuefuki City, Yamanashi Prefecture—in the former Kasugai-cho district—forms part of the Isawa Onsenkyo cluster alongside Isawa Onsen and Hinode Onsen, with the Isawa Onsen itself counted among Japan's 100 famous onsens in recognition of the historic and therapeutic significance of this thermal cluster in the fruit-farming lowlands of the Fuefuki basin. The Kasugai component draws from the same volcanic geological sources as the broader Isawa resort area, famous for its proximity to Kofu City, the Shosenkyo Gorge, and the Yamanashi wine country, and has served as a gateway onsen for visitors to the Mt. Fuji Five Lakes region for well over a century. Bathing at Kasugai within the context of this celebrated nationally recognized cluster connects visitors to one of Japan's officially designated most historically and therapeutically significant thermal resort traditions.