Nakoso Onsen Seki no Yu
勿来温泉 関の湯
Pacific-view bath complex with a rotenburo and lodging in Iwaki
Day Use
YesIncludes loungewear and a towel set. Preschoolers are free, or 510 yen if they borrow loungewear and towels. An 8-ticket booklet is 10,000 yen.
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
Private onsen bath in guest rooms, for overnight guests only
Shared bathing area for all genders
Policies & Services
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
Relaxation space for after bathing
Views
SeaHighlights
Utaseyu
Jet Bath
Steam SaunaAbout
Seki no Yu is a big bath complex in Iwaki, built around the sea. The rotenburo (露天風呂) and the utaseyu (打たせ湯, a stream of water falling on the shoulders) face the Pacific, and there are indoor baths, a jet bath, a far-infrared sauna, a steam sauna with aroma and a cold plunge. The baths use spring water. Some guest rooms come with their own spring bath and a sea view. It works as a day-trip stop and as an inn at once: a restaurant on the third floor, a lounge, separate nap rooms for men and women, and loungewear and a towel set that come with the day-use ticket.
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Last updated October 11, 2026