Wakoshi no Yu, a natural free-flowing hot spring, and one of the prefecture's largest five-tier stadium saunas
Yamanashi Kofu City
A day-use hot spring facility in Kofu known for its variety of thoughtfully designed bathing areas. The weakly alkaline simple hot spring Wakoshi no Yu is celebrated for its high moisturizing properties and is loved as a "beautiful skin" spring, available as a natural free-flowing source. Sauna facilities are extensive, including one of the prefecture's largest five-tier stadium saunas and a unique Japanese-style cave sauna called the Gensen Kettle Steam Bath where source water drifts at your feet. The deep cold plunge using high-quality well water pairs excellently with the saunas.
TypeNatural Hot Spring
A weakly alkaline simple hot spring rich in sodium and bicarbonate ions. Enjoy this high-quality spring, known as a "beautiful skin" bath, across a variety of pools such as an open-air bath of ancient cypress, a rock bath of Osawa stone, and a large Shigaraki pot bath.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity20people
A dry sauna designed with five tiers so visitors can experience a wide range of perceived temperatures; it is one of the largest in the prefecture. You can watch the large TV and change your seating position according to your condition and preference to enjoy comfortable sweating.
Sauna TypeSteam Sauna
Capacity5people
A stylish Japanese-style cave sauna where the source water gently drifts at your feet. The steam from the source and the effect of negative ions warm the body softly from the core. The space feels less stuffy and provides a soothing environment that helps moisturize skin and hair.
Water Qualitywell
Capacity4people
A deep cold plunge located in the indoor bathing area. It uses high-quality well water, with water temperatures mildly around 19–22°C. Its gently enveloping coolness lets you cool down comfortably without strain.
Closed Days: Wednesday
590-3 Kamiabara-cho, Kofu, Yamanashi 400-0814, Japan
Gender Access
Gender Separated
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
Wakoshi no Yu, a natural free-flowing hot spring, and one of the prefecture's largest five-tier stadium saunas
Yamanashi Kofu City
A day-use hot spring facility in Kofu known for its variety of thoughtfully designed bathing areas. The weakly alkaline simple hot spring Wakoshi no Yu is celebrated for its high moisturizing properties and is loved as a "beautiful skin" spring, available as a natural free-flowing source. Sauna facilities are extensive, including one of the prefecture's largest five-tier stadium saunas and a unique Japanese-style cave sauna called the Gensen Kettle Steam Bath where source water drifts at your feet. The deep cold plunge using high-quality well water pairs excellently with the saunas.
TypeNatural Hot Spring
A weakly alkaline simple hot spring rich in sodium and bicarbonate ions. Enjoy this high-quality spring, known as a "beautiful skin" bath, across a variety of pools such as an open-air bath of ancient cypress, a rock bath of Osawa stone, and a large Shigaraki pot bath.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity20people
A dry sauna designed with five tiers so visitors can experience a wide range of perceived temperatures; it is one of the largest in the prefecture. You can watch the large TV and change your seating position according to your condition and preference to enjoy comfortable sweating.
Sauna TypeSteam Sauna
Capacity5people
A stylish Japanese-style cave sauna where the source water gently drifts at your feet. The steam from the source and the effect of negative ions warm the body softly from the core. The space feels less stuffy and provides a soothing environment that helps moisturize skin and hair.
Water Qualitywell
Capacity4people
A deep cold plunge located in the indoor bathing area. It uses high-quality well water, with water temperatures mildly around 19–22°C. Its gently enveloping coolness lets you cool down comfortably without strain.
Closed Days: Wednesday
590-3 Kamiabara-cho, Kofu, Yamanashi 400-0814, Japan
Gender Access
Gender Separated
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