Hirao Onsen
TypeNatural Hot Spring
A cold chloride and bicarbonate mineral spring that warms the body to the core. It has high moisturizing properties and is notable for being less likely to cause chills after bathing.
Panoramic views of Mount Tateshina and the Yatsugatake range and an authentic sauna
Nagano Saku City
Hirao Onsen Miharashi no Yu, located in Saku, Nagano Prefecture, is a hot spring facility proud of its panoramic views of Mount Tateshina and the Yatsugatake range. It features a far-infrared sauna reaching nearly 100°C and a relaxed cold plunge bath around 18°C, and you can experience the ultimate totonou (state of perfect relaxation) in the outdoor relaxation area with spectacular views.
TypeNatural Hot Spring
A cold chloride and bicarbonate mineral spring that warms the body to the core. It has high moisturizing properties and is notable for being less likely to cause chills after bathing.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity20people
An authentic far-infrared sauna using a gas-fired double far-infrared heater. It reaches high temperatures of about 90-100°C, allowing you to sweat thoroughly while being enveloped in the scent of wood.
Capacity4people
A cold plunge bath located close to the sauna room. It has a substantial depth and a comfortable temperature of around 18°C for a pleasant cool-down.
Closed Days: None
2682 Shimohirao, Saku, Nagano 385-0003, 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
Panoramic views of Mount Tateshina and the Yatsugatake range and an authentic sauna
Nagano Saku City
Hirao Onsen Miharashi no Yu, located in Saku, Nagano Prefecture, is a hot spring facility proud of its panoramic views of Mount Tateshina and the Yatsugatake range. It features a far-infrared sauna reaching nearly 100°C and a relaxed cold plunge bath around 18°C, and you can experience the ultimate totonou (state of perfect relaxation) in the outdoor relaxation area with spectacular views.
TypeNatural Hot Spring
A cold chloride and bicarbonate mineral spring that warms the body to the core. It has high moisturizing properties and is notable for being less likely to cause chills after bathing.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity20people
An authentic far-infrared sauna using a gas-fired double far-infrared heater. It reaches high temperatures of about 90-100°C, allowing you to sweat thoroughly while being enveloped in the scent of wood.
Capacity4people
A cold plunge bath located close to the sauna room. It has a substantial depth and a comfortable temperature of around 18°C for a pleasant cool-down.
Closed Days: None
2682 Shimohirao, Saku, Nagano 385-0003, 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