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Saitama Soka City
Located in Soka City, Saitama Prefecture, the Yunoizumi Soka Health Center is a prestigious bathing facility that has been leading sauna culture. The high-temperature sauna, with a three-tier structure accommodating up to 40 people, hosts heat wave löyly sessions where you can experience a heat sensation exceeding 100°C, promoting heavy sweating and a refreshing heat experience. The cold plunge bath uses continuously flowing underground water, enveloping the body in a soft, clear coldness. Outdoors, there is an artificial hot spring called 'Kusatsu no Yu,' replicating the beneficial components of Kusatsu Onsen, with the scent of sulfur and the stimulating water providing a pleasant and healing experience. The facility also offers dining and relaxation spaces, allowing you to enjoy a 'cycle of heat and healing' throughout the day.
TypeArtificial Hot Spring
An artificial hot spring replicating the authentic Kusatsu no Yu, using a liquid bath additive concentrated with the beneficial components of Kusatsu Onsen in Gunma Prefecture. It features a sulfur scent similar to acidic waters, tightening the skin and promoting blood circulation. After bathing, the warmth lingers, allowing you to easily enjoy the refreshing sensation unique to Kusatsu.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity40people
A standard high-temperature sauna with a three-tier structure that can accommodate up to 40 people, featuring a high ceiling. Equipped with two gas and stone heaters, it maintains high temperature and humidity. During scheduled löyly events, steam and heat rise rapidly, designed to promote sweating and provide a strong heat impact.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity10people
Known as the 'Strong Vibra Cold Plunge Bath that Strips Away the Protective Layer,' it uses abundant underground water in a continuous flow. Although the set temperature is about 15°C, the vibra and clear water quality make the perceived temperature even lower. It is the perfect cold plunge bath for cooling down right after a sauna.
Closed Days: None
2-23-23 Kitaya, Soka City, Saitama Prefecture
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—
Saitama Soka City
Located in Soka City, Saitama Prefecture, the Yunoizumi Soka Health Center is a prestigious bathing facility that has been leading sauna culture. The high-temperature sauna, with a three-tier structure accommodating up to 40 people, hosts heat wave löyly sessions where you can experience a heat sensation exceeding 100°C, promoting heavy sweating and a refreshing heat experience. The cold plunge bath uses continuously flowing underground water, enveloping the body in a soft, clear coldness. Outdoors, there is an artificial hot spring called 'Kusatsu no Yu,' replicating the beneficial components of Kusatsu Onsen, with the scent of sulfur and the stimulating water providing a pleasant and healing experience. The facility also offers dining and relaxation spaces, allowing you to enjoy a 'cycle of heat and healing' throughout the day.
TypeArtificial Hot Spring
An artificial hot spring replicating the authentic Kusatsu no Yu, using a liquid bath additive concentrated with the beneficial components of Kusatsu Onsen in Gunma Prefecture. It features a sulfur scent similar to acidic waters, tightening the skin and promoting blood circulation. After bathing, the warmth lingers, allowing you to easily enjoy the refreshing sensation unique to Kusatsu.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity40people
A standard high-temperature sauna with a three-tier structure that can accommodate up to 40 people, featuring a high ceiling. Equipped with two gas and stone heaters, it maintains high temperature and humidity. During scheduled löyly events, steam and heat rise rapidly, designed to promote sweating and provide a strong heat impact.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity10people
Known as the 'Strong Vibra Cold Plunge Bath that Strips Away the Protective Layer,' it uses abundant underground water in a continuous flow. Although the set temperature is about 15°C, the vibra and clear water quality make the perceived temperature even lower. It is the perfect cold plunge bath for cooling down right after a sauna.
Closed Days: None
2-23-23 Kitaya, Soka City, Saitama Prefecture
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