Karatsu Seaside Hotel
唐津シーサイドホテル
A seaside hotel with natural hot-spring baths in both wings
Day Use
YesDay-use bathing is 1,800 yen for adults on weekdays and 2,000 yen on weekends and holidays (1,300/1,400 yen for school-age children, 900/1,000 yen for preschoolers), with a rental towel included. Guests who eat at the hotel restaurant first can bathe afterward at a discounted rate, 1,000 yen on weekdays or 1,200 yen on weekends and holidays.
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
A private bath you can reserve for yourself or your group
Day visitors can book the private bath, not only overnight guests
Private onsen bath in guest rooms, for overnight guests only
Shared bathing area for all genders
Policies & Services
Welcomes children and families
Children may use the baths and pool when accompanied by an adult; swimwear is required outside the main bath.
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
On-site or nearby parking available
Views
SeaHighlights
Ganbanyoku
Steam SaunaAbout
This hotel sits on the coast in Karatsu, with two connecting wings, east and west, each running its own natural hot-spring bath. Both have an indoor bath and an open-air bath facing the sea, plus a hot dry sauna and a women's mist sauna; the east wing's sauna also has a cold-water bath beside it. The east wing adds a small sauna lounge upstairs with a few themed rooms, including rock-bed bathing (ganbanyoku, 岩盤浴). Day visitors can bathe in the west wing; the east wing's spa and pool are for hotel guests only. Every room has a sea view, and one room type, the Presidential Ocean Suite, has its own private open-air onsen bath.
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Last updated September 29, 2026