Iwaiya
岩井屋いわいや
San'in's oldest hot spring, in a 150-year-old wooden ryokan
Day Use
YesDay-use bathing may be unavailable on open days due to cleaning or maintenance.
Adults 1,000 yen / Children 500 yen. Towel 200 yen / Bath towel rental 300 yen.
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Bathing Arrangements
A private bath you can reserve for yourself or your group
Private onsen bath in guest rooms, for overnight guests only
The room-amenities list has no in-room bath; bathing is only via the three shared baths plus the one reservable private bath.
Shared bathing area for all genders
Policies & Services
Welcomes children and families
Because the whole building is wood and sound carries easily, families with children are limited to certain rooms (the annex/離れ can accommodate them).
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
RiverHighlights
Drinking SpringPrograms
About
Iwaiya sits in Iwai Onsen (岩井温泉), a spring the inn claims has run for 1,300 years and is the oldest in the San'in region. The building itself is 150 years old: a three-story wooden structure where every room is laid with tatami. There are three baths to move between. The signature indoor bath, Gensen Choju-no-yu (源泉長寿の湯), is unusually deep, designed for standing chest-deep while spring water rises through pine boards underfoot. The bamboo-fenced outdoor bath, Sedo-no-yu (背戸の湯), sits in a small pavilion garden. The second indoor bath, Iwai-no-yu (祝いの湯), has a calmer feel; the two main baths swap between men and women late at night. A private reserved bath, Yoimachi-gusa (よいまち草), is also available by reservation. All the water is free-flowing from the natural spring. The inn is a member of Nihon Hito o Mamoru Kai (日本秘湯を守る会) and preserves an old bathing custom called yukamuri (ゆかむり) associated with this spring.
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Last updated September 22, 2026