Joso Onsen & Sauna Oyu Musubi
常総ONSEN＆SAUNA お湯むすび
Two-floor sauna and onsen complex beside a roadside station
Day Use
YesOpen every day, with a few maintenance closures scattered through the year.
Price shown is the standard walk-in adult rate; a paid LINE membership brings it down and unlocks a weekday night discount and a student rate. Towels cost extra (rental or purchase). The 2F coed sauna floor is an add-on of about 1,400 to 1,500 yen on top of entry and can't be bought on its own; it's closed to elementary-school-age children and under.
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Sauna room of any kind
Cold water plunge bath, typically used after sauna
Bathing Arrangements
Shared bathing area for all genders
Policies & Services
A restaurant or dining room open to visitors, not only meals for overnight guests
Shower, wash stations, soap and shampoo provided
Towels to rent or borrow at the desk
Relaxation space for after bathing
On-site or nearby parking available
Highlights
Foot Bath
Steam Sauna
Jet BathAbout
This is a large day-use bathhouse with its own onsen well, next to a roadside station just off the Joso IC of the Ken-O Expressway. The ground floor has an open-air bath and an indoor carbonated bath filled with alkaline spring water, soft on the skin, plus a cold plunge drawn from natural groundwater and a foot bath in the outdoor rest area. Upstairs is a separate coed sauna floor, used in swimwear or the loungewear provided, with eight sauna rooms and a dedicated cool-down room; it costs extra on top of entry and is closed to elementary-school-age children. There's also a restaurant that can be used on its own.
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Last updated September 29, 2026