Kogashima Onsen
虹岳島温泉こがしまおんせん
Fukui's only secluded-hot-spring inn on Lake Suigetsu
Day Use
YesAdults (middle school age and older) ¥1,000; children (elementary school age and younger) ¥500. Call ahead to confirm availability as day-use may be unavailable when occupied with lodging guests.
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Sauna room of any kind
Bathing Arrangements
A private bath you can reserve for yourself or your group
Only sourced from a Nifty Onsen listing tag; not corroborated by the official site or the 日本秘湯を守る会 provider page (which are silent on it, not an explicit no). Worth confirming.
Private onsen bath in guest rooms, for overnight guests only
Rooms have an ordinary unit bath + toilet, not an onsen bath.
Shared bathing area for all genders
Policies & Services
Welcomes children and families
Day-use bathing has a published child price tier (elementary age and under), implying children are welcome; no explicit age-restriction policy stated.
A restaurant or dining room open to visitors, not only meals for overnight guests
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
Views
LakePrograms
About
Kogashima-so (虹岳島荘) sits alone on the shore of Lake Suigetsu (水月湖), part of the Mikata Five Lakes in Fukui. The inn has both indoor and open-air baths fed by a free-flowing spring. The water feels noticeably smooth and slippery with a faint mineral scent. It is one of the few Fukui members of Nihon Hito wo Mamoru Kai (日本秘湯を守る会), the association of remote hot spring inns. The building is old and shows its age, but the spring draws repeat visitors, and the rooms look out over the lake.
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Last updated September 19, 2026