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Hotel Spax Kusatsu
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Hot Springs

"The Focus on Spring Quality": Kusatsu Onsen's Free-Flowing Hot Springs

Kusatsu Onsen is blessed with excellent spring water quality and an abundant supply of hot spring water.
Historical records show that people, even during the Sengoku period (Warring States period), traveled there on horseback, visiting the area to seek healing from illness.
The culture of therapeutic hot springs has also been passed down, and perhaps the main reason why so many people still love Kusatsu Onsen today is the blessings of nature.

Kusatsu Onsen, a famous hot spring Kusatsu in Japan

Kusatsu Onsen boasts the largest natural hot spring water output in Japan, at 32,000 liters per minute.
In particular, our inn's hot spring source is the "Bandai Gensen," which boasts the largest volume of hot spring water in Kusatsu Onsen.
Because it boasts powerful sterilizing properties and various therapeutic effects, the hot spring water is used directly from the source and flows continuously.
Enjoy the famous Kusatsu Onsen to your heart's content in the large public bath and open-air bath (with alternating use).

  • Large public bath, indoor bath

    Relax your body and mind in our 24-hour natural hot spring baths, relieving the fatigue of everyday life.
    Hot spring bath hours
    		24H(Cleaning time: 6:00 to 6:30 /From 10:00 to 12:00)
    Hot spring bathing category
    		One location each for men and women.
    Characteristics
    		【Location】B1F

  • Large public bath, open-air bath

    The open-air bath, surrounded by greenery, is enveloped in the sounds of birdsong and the continuous flow of hot spring water, and the crisp air sharpens all your senses.
    Relax and unwind in our open-air bath.
    Hot spring bath hours
    		24H(Cleaning time: 6:00 to 6:30 /From 10:00 to 12:00)
    Hot spring bathing category
    		Gender-separated system
    Characteristics
    		【Location】B1F
    Cautions
    		The baths are separated into indoor baths for men and women, but there is only one open-air bath, so it is switched between men and women every day.
    (Example) On the day of hotel check-in, there is a men's-only open-air bath, and the next day only the indoor bath is available.
    Instead, that day becomes a women-only open-air bath, and the baths alternate every day.

  • Sauna

    Both men's and women's facilities include sauna rooms.
    Hot spring bath hours
    		15:00 to 22:00
    Hot spring bathing category
    		One location each for men and women.
    Characteristics
    		【Location】B1F(Inside the large public bath)

  • Changing room

    You can use the small lockers (free of charge) for your valuables located at the entrance.

List of hot spring information

Hot Springs

Kusatsu Onsen (100% natural hot spring water) - free-flowing hot spring water*Excluding artificial hot springs

Hot Spring Qualities

pH=1.54 / Strongly acidic spring

Spring temperature

94.2℃

Maximum gushing amount

6,200L / min

Open Air Bath

Yes (only one bath available for men or women (including mixed baths) - private use not available)

Number of bathhouses

［Open-air bath］man:1 woman:0 Mixed bathing:0
［Indoor bath］man:1 woman:1 Mixed bathing:0
［Sauna］man:1 woman:1 Mixed bathing:0

Other bath facilities

Sauna(15:00 to 22:00)

Bath usage conditions

The open-air bath is available for men and women on a rotating schedule.

Hot spring tax

A separate hot spring tax of 150 yen per adult will be charged.