丸沼高原 シャレー丸沼 座禅温泉まるぬまこうげん シャレーまるぬま ざぜんおんせん
Reception closes at 16:30, though the bath stays open until 17:30. There is no fixed weekly closed day, but the bath may close or change hours without notice for private bookings or maintenance.
Adult ¥800, elementary-school children ¥600. Rental bath towel ¥400, valuables locker ¥100.
Uses natural hot spring water
Enclosed indoor bathing area
Dry heat sauna room
Private onsen bath in guest rooms, for overnight guests only
Guest rooms are plain lodge rooms with no bath; bathing is at the shared 座禅温泉 only.
Shared bathing area for all genders
Welcomes children and families
Children under about 7 may bathe with an opposite-sex parent/guardian; from about age 7 up, gender-separated bathing is enforced.
Restaurant or dining open to visitors (not just hotel meal plans)
The public restaurant Plateau is in the same センターステーション building as the day-use bath, not run by the lodge itself.
Shower, wash stations, soap and shampoo provided
Towels available to rent or borrow
Relaxation space for after bathing
On-site or nearby parking available
Free on weekdays; paid (¥1,000) on weekends, holidays and New Year peak dates unless holding a season pass.
Mixed source
A sodium-calcium sulfate spring emerging hot at 45 °C. Moderately mineralized (2,217 mg/kg dissolved solids), it carries the quiet, settled body characteristic of sulfate waters.
Sampled at mixing tank·Analyzed Sep 28, 2020·公益財団法人 中央温泉研究所·Cert no. 14建地衛第1号
Chalet Marunuma is a plain, self-catering ski lodge built right on the slope at 1,400 meters on Marunuma Kogen, with twenty simple tatami rooms. Guests bathe in a shared hot-spring bath, drawn from a spring found only on this mountain, open from mid-afternoon until the next morning. A separate day-use bath, Zazen Onsen (座禅温泉), with a sauna, runs afternoons in the base center building nearby. Rooms have no bath of their own, and there's no restaurant service beyond a free coffee and bread each morning, so most guests bring their own food. It's an old, lived-in kind of place, more mountain hut than polished ryokan, right at the edge of the slope for skiers who want to step straight out onto the run.
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Last updated August 5, 2026