Tokachigawa Onsen Sasai Hotel
十勝川温泉 笹井ホテルとかちがわおんせん ささいホテル
Day Use
YesLast admission 20:00. Access may be limited during New Year, Obon, and Golden Week, the hotel's busiest periods.
Child (age 3 to elementary school) ¥500. Face towel rental ¥150, bath towel rental ¥300. Bathing plus dinner buffet (reservation required): from ¥5,500 adult, ¥4,400 elementary school, ¥3,300 infant. Bathing plus breakfast buffet (reservation required): ¥2,750 adult, ¥1,650 elementary school, ¥880 infant.
Bathing & Water
Uses natural hot spring water
Plant-derived moor onsen (peat/lignite-origin), kakenagashi (source-fed).
Open-air outdoor bath
Enclosed indoor bathing area
Dry heat sauna room
Cold water plunge bath, typically used after sauna
Capabilities
Private bath available for day-use visitors or hotel guests to reserve
Shared bathing area for all genders
Baths are listed separately for women's and men's use with no mixed-bathing option mentioned; facilities table also lists 混浴 (mixed) count as 0.
Policies & Services
Welcomes children and families
Restaurant or dining open to visitors (not just hotel meal plans)
Open-kitchen buffet restaurant accessible to day-use visitors via the bathing + dinner plan (reservation required).
Shower, wash stations, soap and shampoo provided
Towels available to rent or borrow
Relaxation space for after bathing
Rest area (お休み処) in front of the 1F large bath, sells soft-serve ice cream.
On-site or nearby parking available
Views
MountainsHighlights
Utaseyu
Jet BathAbout
Sasai Hotel bathes in Tokachigawa's moor onsen, a plant-derived spring whose peat gives the water an amber tint and a smooth, mild feel on the skin, kept flowing fresh from the source. The large baths are split for men and women and mix indoor and outdoor options, including a hinoki wood tub, a round jar bath (tsubo-buro, つぼ風呂), a jet bath, and a waterfall bath (utase-yu, 打たせ湯), plus a sauna and a cold plunge. Day-use bathing runs from early afternoon into the evening. The hotel's own history traces back to 1900, when the first bath that founded Tokachigawa Onsen was built here, and by 1913 it had grown into a ryokan called Sasai, one of the oldest in the district. Parts of the building and the dining hall have been renovated over the years, and guests often mention a genuinely old-style stay (tatami-floored changing rooms included) that stays quiet even when the hotel is busy with tour groups.
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Last updated July 17, 2026