Yayoi no Yu
やよいの湯やよいのゆ
Day Use
YesClosed on the second Tuesday of each month. Bathing reception ends at 20:20, 40 minutes before the 21:00 closing.
Adult (junior high and up) ¥600, child (elementary school) ¥400, preschoolers free. The single family/private bath room is ¥1,800 plus admission for 90 minutes, phone reservation recommended (reception 11:00 to 18:00). On the 26th of each month, discount day Furo no Hi (風呂の日), admission drops to ¥400 for adults and ¥300 for children. A combo ticket with the roadside station's aquarium, Banjo Osakana-kan (番匠おさかな館), is available at a small discount.
Bathing & Water
Open-air outdoor bath
Both bath areas have an outdoor bath, but it is currently operated purely as a cold-water bath (not a heated rotenburo); a maintenance closure of the outdoor bath ended 2026-06-12.
Enclosed indoor bathing area
Dry heat sauna room
Three sauna types across the two bath areas: automatic-loyly Finnish sauna and far-infrared sauna (western-style area), salt sauna (Japanese-style area).
Cold water plunge bath, typically used after sauna
Uses natural hot spring water
The facility's own copy names its baths after commercial artificial mineral-water systems (Komyoseki-onsen, calcium-onsen) rather than claiming a natural underground source (no 源泉/掘削 mentioned anywhere on the official site). Komyoseki-onsen is marketed by its manufacturer explicitly as jinko onsen (artificial hot spring); an aggregator write-up (supersento.com, fetched directly) likewise describes the water as an artificial mineral bath rather than natural onsen. One Google reviewer was ambivalent ("一応温泉ではあるが、あまり泉質的なものは感じることができなかった"). Treated as NO with medium confidence pending on-site confirmation.
Capabilities
Private bath available for day-use visitors or hotel guests to reserve
Only one family/private bath room; phone reservation strongly recommended.
Shared bathing area for all genders
Policies & Services
Allows entry with visible tattoos
Welcomes children and families
Children who still require diapers cannot use the general (gender-separated) baths, but can use the reservable family/private bath instead.
Restaurant or dining open to visitors (not just hotel meal plans)
Adjacent Cafe Rin (11:00-18:00) and お食事処くうちくり (10:00-16:00) at the same roadside station, both open to day-use bath visitors.
Shower, wash stations, soap and shampoo provided
Towels available to rent or borrow
Described by the reviewer as a towel for sale rather than explicitly a rental; treated as satisfying the day-use towel-service sense.
Relaxation space for after bathing
On-site or nearby parking available
Views
MountainsHighlights
Utaseyu
Jet BathPrograms
About
Yayoi no Yu is the day-use bathhouse at Michinoeki Yayoi, a roadside station (道の駅) in Saiki. It runs two bathing areas, western-style and Japanese-style, that swap men's and women's assignment by odd or even calendar day. The western side has a calcium mineral bath, a jet bath, a far-infrared sauna, and an automatic-loyly Finnish sauna that releases steam every 45 minutes. The Japanese side has a Komyoseki (光明石) mineral bath, a salt sauna, and an utaseyu (打たせ湯) waterfall bath, with its outdoor bath set against a mountain view. Both outdoor baths currently run as cold plunges rather than heated tubs, a combination sauna regulars come back for. A single family bath can be booked by phone, and the building also has table tennis rooms, an underground rest area, and a cafe and restaurant next door.
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Last updated July 7, 2026