Onsen

Melt into the water

100% natural hot spring, flowing 24 hours a day

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Kusatsu is a spa town said to have the greatest natural flow of hot spring water in Japan.

One of the baths has hinoki-clad walls and stone, with coloured glass letting the light in at the window. In that quiet corner of the town there is time simply to sit in the water, with no need to watch the clock. It is a small house of eight rooms, and the baths are private.

The source and the water

100% natural hot spring, flowing 24 hours a day

Spa town	Kusatsu Onsen
Source	Bandaiko
Type of water	Acidic hydrogen–sulfate / chloride spring (hypotonic, acidic, high-temperature)
Temperature at source	94.6℃
Source location	Shirane National Forest 63-ha, Kusatsu, Kusatsu-machi, Agatsuma-gun, Gunma
Source held by	Kusatsu Town
Use	For bathing
Analysed by	Gunma Pharmaceutical Association (analysis registration no. Gunma-yaku 2)

The temperature above is the temperature at the source. There are four baths: two on the ground floor and two on the lower ground floor. All four baths are 100% natural hot spring, flowing 24 hours a day.

The private baths are open 24 hours and need no reservation. There are no towels in the bathing rooms — please bring the towels from your room. A yukata is provided in the room.

Please note

Please do not use the bath if you are unwell.
Please avoid bathing after drinking.
Drink water often.
We do not accept guests under 12 years of age.

About the sauna

Frequently asked questions

What kind of spring water is it?

All four baths are fed straight from the source. The source is Bandaiko, and the water is an acidic hydrogen–sulfate / chloride spring (hypotonic, acidic, high-temperature). The temperature at the source is 94.6℃.

From what time can I use it?

The private baths are open 24 hours. The sauna is open from 15:00 to 22:00.

Can it be taken privately?

The baths are private. There are four of them — Haru, Natsu, Aki and Huyu — and all are fed straight from the source. No reservation is needed, and they are open 24 hours.

Are towels provided?

Towels are provided in the room. There are no towels in the bathing rooms, so please bring the towels from your room. A yukata is also provided in the room.