A skin-beautifying private spring with a 300-year history and highland open-air bathing in the fresh air at the foot of the Tateshina Mountains
Nagano Saku City
"Kasuga Onsen Kasuga no Mori" is a hot spring inn in Saku City, Nagano Prefecture, with a history of more than 300 years since its opening. Its private spring, embraced by the rich nature at the foot of the Tateshina Mountains, is abundant in metasilicic acid, a beauty ingredient, and is well regarded as a beautifying bath that leaves the skin soft and moisturized. Both the large bath and the medium bath feature garden-style open-air baths surrounded by greenery, ultrasonic bubble baths, and authentic dry sauna facilities. Bathed in the clear highland air at an elevation of 900m, you can enjoy a truly exceptional relaxation experience.
TypeNatural Hot Spring
A garden-style open-air rock bath extending outside the large bath and medium bath, surrounded by lush greenery. This bath is filled with luxurious free-flowing water direct from the source. You can enjoy an exceptional skin-beautifying bath while soaking in the beautiful highland scenery, from fresh green leaves to autumn colors and clear snowy landscapes. Alternates daily between men and women.
TypeNatural Hot Spring
A private bath installed inside the guest room. At Kasuga no Mori, every guest room bath is supplied with hot spring water from Kasuga Onsen, so you can enjoy a luxurious hot spring bath anytime you like, right in your room, without having to go to the large bath.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity6people
A small but well-used and clean dry sauna. The temperature is set so it heats you thoroughly, and the quiet room encourages comfortable sweating. You can work up a good sweat in the stillness surrounded by nature.
Closed Days: None
2258-1 Kasuga, Saku City, Nagano 384-2205
Gender Access
Gender Separated
The above applies to the communal (shared) baths. At facilities with private baths or private saunas, guests with tattoos may still be able to bathe. Please check with the facility for details.
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn moreA skin-beautifying private spring with a 300-year history and highland open-air bathing in the fresh air at the foot of the Tateshina Mountains
Nagano Saku City
"Kasuga Onsen Kasuga no Mori" is a hot spring inn in Saku City, Nagano Prefecture, with a history of more than 300 years since its opening. Its private spring, embraced by the rich nature at the foot of the Tateshina Mountains, is abundant in metasilicic acid, a beauty ingredient, and is well regarded as a beautifying bath that leaves the skin soft and moisturized. Both the large bath and the medium bath feature garden-style open-air baths surrounded by greenery, ultrasonic bubble baths, and authentic dry sauna facilities. Bathed in the clear highland air at an elevation of 900m, you can enjoy a truly exceptional relaxation experience.
TypeNatural Hot Spring
A garden-style open-air rock bath extending outside the large bath and medium bath, surrounded by lush greenery. This bath is filled with luxurious free-flowing water direct from the source. You can enjoy an exceptional skin-beautifying bath while soaking in the beautiful highland scenery, from fresh green leaves to autumn colors and clear snowy landscapes. Alternates daily between men and women.
TypeNatural Hot Spring
A private bath installed inside the guest room. At Kasuga no Mori, every guest room bath is supplied with hot spring water from Kasuga Onsen, so you can enjoy a luxurious hot spring bath anytime you like, right in your room, without having to go to the large bath.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity6people
A small but well-used and clean dry sauna. The temperature is set so it heats you thoroughly, and the quiet room encourages comfortable sweating. You can work up a good sweat in the stillness surrounded by nature.
Closed Days: None
2258-1 Kasuga, Saku City, Nagano 384-2205
Gender Access
Gender Separated
The above applies to the communal (shared) baths. At facilities with private baths or private saunas, guests with tattoos may still be able to bathe. Please check with the facility for details.
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more