Today after a mountain hike we stopped by Komakusa no Yu. The water is alkaline, but couldn't find a composition sign. The indoor bath has a mountain view. There's a sauna, cold bath, jet bath, and a medicated bath. The outdoor bath is in stone, with benches and chairs where you can chill and look at the mountains. Water is 40-41, in both the indoor bath and the rotenburo it has a slight chlorine smell. On the second floor there are massage chairs, massage beds, hammocks, and a balcony with a river view. It's peak season now so it's crowded, mostly hikers. There's a restaurant, but better to go to the diner across the street, Meijitei — their sauce katsudon is the local gourmet specialty.
Hayataro Onsen Komakusa-no-yu Hot Spring
早太郎温泉 こまくさの湯はやたろうおんせん こまくさのゆ
Other
Day Use
YesMon10:00–21:00
Tue10:00–21:00
WedClosed
Thu10:00–21:00
Fri10:00–21:00
Sat10:00–21:00
Sun10:00–21:00
Last admission 20:00 (1 hr before close). Wednesdays may open with hours extended to 23:00 from July to September 2026, per the official site; occasional maintenance closures also occur (e.g. April 1-2, 2026).
¥700
Adult (junior-high age and up) ¥700, elementary-school child ¥300, preschool child free. Valid once per day; re-entry needs a new ticket.
Bathing & Water
Natural onsen water
Uses natural hot spring water
Outdoor BathYes
Open-air outdoor bath
Indoor BathYes
Enclosed indoor bathing area
SaunaYes
Dry heat sauna room
Cold BathYes
Cold water plunge bath, typically used after sauna
Capabilities
Mixed BathingNo
Shared bathing area for all genders
Baths rotate monthly between two named gender-separated baths (東駒の湯/西駒の湯); no mixed bathing offered.
Policies & Services
TattooYes
Allows entry with visible tattoos
Not an official policy statement — based on two independent visitor reports (2023, 2024) of no anti-tattoo signage and successful entry with visible tattoos.
KidsYes
Welcomes children and families
Tiered pricing for junior-high+, elementary-school children, and free entry for preschoolers; a Google review also notes a baby chair is provided.
DiningYes
Restaurant or dining open to visitors (not just hotel meal plans)
WashingYes
Shower, wash stations, soap and shampoo provided
TowelsYes
Towels available to rent or borrow
Rest AreaYes
Relaxation space for after bathing
ParkingYes
On-site or nearby parking available
Views
MountainsHighlights
Jet BathAbout
Komakusa-no-yu is a day-use onsen on a hillside at the foot of Mt. Komagatake, one of several baths that make up the Hayataro Onsen (早太郎温泉) hot-spring area. The large indoor bath and the open-air bath both face the Central Alps, with the Otagiri River, known locally for its clear blue water, running just below. There's also an herbal bath, a jet bath good for legs tired from a day on the mountain, and a hot sauna paired with a cold plunge. The water itself is smooth and gentle on the skin. The men's and women's sides trade baths every month, so which of the two you get depends on when you visit. Upstairs there's a rest area and a restaurant known locally for its sauce katsu-don. The onsen takes its name from a local legend: about 700 years ago, a dog named Hayataro, raised at the nearby Kozenji (光前寺) temple, was said to have defeated a monster menacing a distant shrine, and the hot spring was named after him.
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Last updated July 17, 2026