A healing bath with a cold plunge bath of Chichibu underground spring water and Saiboku's food
Saitama Hidaka City
"Natural Hot Spring Kachofugetsu" is a day-use onsen facility inside Saiboku in Hidaka City, Saitama Prefecture. Its sodium chloride spring, bubbling up from 2,000m underground, has excellent heat-retaining effects and is also renowned as a therapeutic spring. The sauna is a tower-style setup with far-infrared heaters, filling the entire body with comfortable heat and encouraging deep sweating. A standout feature is the cold plunge bath, which uses luxurious Chichibu underground spring water and has a mellow texture that clings gently to the skin, turning cool-down time into pure bliss. After bathing, you can enjoy Saiboku's proud brand pork dishes, making for a luxurious holiday where food and relaxation come together.
TypeNatural Hot Spring
A colorless, clear sodium chloride spring gushing up from 2,000m underground. Because it contains salt, the water is excellent for retaining heat and moisture, and the warmth lingers long after you get out. You can enjoy this high-quality spring, highly praised by hot spring rehabilitation doctors, in the calm atmosphere of the open-air bath and indoor bath.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity20people
A spacious three-tier dry sauna. Two far-infrared heaters operate powerfully, providing steady heat. Radiant heat slowly penetrates deep into the body, supporting a comfortable sweat. A relaxing space where you can unwind while watching TV, surrounded by the scent of wood.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity2people
A very gentle cold plunge bath drawing on underground spring water from Chichibu. The water temperature is mild at around 20°C, so it is not too cold and you can soak comfortably for a long time. The mellow texture unique to natural water gently wraps around your overheated body, offering a refreshingly cool-down experience.
Closed Days: None
350-1221 546 Shimootayazawa, Hidaka 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
A healing bath with a cold plunge bath of Chichibu underground spring water and Saiboku's food
Saitama Hidaka City
"Natural Hot Spring Kachofugetsu" is a day-use onsen facility inside Saiboku in Hidaka City, Saitama Prefecture. Its sodium chloride spring, bubbling up from 2,000m underground, has excellent heat-retaining effects and is also renowned as a therapeutic spring. The sauna is a tower-style setup with far-infrared heaters, filling the entire body with comfortable heat and encouraging deep sweating. A standout feature is the cold plunge bath, which uses luxurious Chichibu underground spring water and has a mellow texture that clings gently to the skin, turning cool-down time into pure bliss. After bathing, you can enjoy Saiboku's proud brand pork dishes, making for a luxurious holiday where food and relaxation come together.
TypeNatural Hot Spring
A colorless, clear sodium chloride spring gushing up from 2,000m underground. Because it contains salt, the water is excellent for retaining heat and moisture, and the warmth lingers long after you get out. You can enjoy this high-quality spring, highly praised by hot spring rehabilitation doctors, in the calm atmosphere of the open-air bath and indoor bath.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity20people
A spacious three-tier dry sauna. Two far-infrared heaters operate powerfully, providing steady heat. Radiant heat slowly penetrates deep into the body, supporting a comfortable sweat. A relaxing space where you can unwind while watching TV, surrounded by the scent of wood.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity2people
A very gentle cold plunge bath drawing on underground spring water from Chichibu. The water temperature is mild at around 20°C, so it is not too cold and you can soak comfortably for a long time. The mellow texture unique to natural water gently wraps around your overheated body, offering a refreshingly cool-down experience.
Closed Days: None
350-1221 546 Shimootayazawa, Hidaka 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