Komoro Grand Castle Hotel
小諸グランドキャッスルホテル
City hotel with an onsen bath looking over Mimakigahara
Day Use
YesDay-use bathing may be suspended on busy dates or during peak season.
Bring your own bath towel; a face towel is available for a small fee. Child day-use price is 350 yen.
Bathing & Water
Uses natural hot spring water
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
Allows entry with visible tattoos
Welcomes children and families
Infants still in diapers may enter the bathing area but not the tub itself.
Shower, wash stations, soap and shampoo provided
Towels to rent or borrow at the desk
Bring your own bath towel for day-use bathing; a face towel can be had for a small fee.
On-site or nearby parking available
Views
MountainsAbout
This is a city hotel a short walk from Komoro Station, with an indoor bath drawing on its own hot-spring source. The water is described as faintly scented and warming, and the bath looks out toward the Mimakigahara hills. There's a low-temperature self-service sauna and a cold plunge alongside it. Rooms and public areas show their age, but the bath is also open to non-guests for day-use bathing.
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Last updated September 29, 2026