Stadium sauna
90°CSauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity25people
Large stadium sauna using far-infrared heaters. It is tiered so you can sweat thoroughly at your preferred temperature level.
A super sento known for its spacious saunas and abundant baths
Nagano Nagano City
Koutoku no Yu is a super sento located in Hirotoku, Nagano City. The facility features a large far-infrared stadium sauna that can accommodate more than 20 people and a spacious cold plunge bath that can hold nearly 10 people. The open-air bath area includes a wooden deck where you can enjoy relaxed outdoor relaxation. There are also a variety of other baths, allowing you to relax all day.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity25people
Large stadium sauna using far-infrared heaters. It is tiered so you can sweat thoroughly at your preferred temperature level.
Sauna TypeSalt Sauna
Capacity4people
Women-only salt sauna. You can take your time sweating while caring for your skin.
Water QualityTap Water
Capacity10people
Depth 80–110 cm, a spacious cold plunge bath that can hold about 10 people. You can stretch your legs and relax while cooling down.
Closed Days: None
141 Hirota, Nagano City, Nagano 381-2213, 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
A super sento known for its spacious saunas and abundant baths
Nagano Nagano City
Koutoku no Yu is a super sento located in Hirotoku, Nagano City. The facility features a large far-infrared stadium sauna that can accommodate more than 20 people and a spacious cold plunge bath that can hold nearly 10 people. The open-air bath area includes a wooden deck where you can enjoy relaxed outdoor relaxation. There are also a variety of other baths, allowing you to relax all day.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity25people
Large stadium sauna using far-infrared heaters. It is tiered so you can sweat thoroughly at your preferred temperature level.
Sauna TypeSalt Sauna
Capacity4people
Women-only salt sauna. You can take your time sweating while caring for your skin.
Water QualityTap Water
Capacity10people
Depth 80–110 cm, a spacious cold plunge bath that can hold about 10 people. You can stretch your legs and relax while cooling down.
Closed Days: None
141 Hirota, Nagano City, Nagano 381-2213, 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