Aoki Onsen

あおき温泉

Standing quietly amid peaceful rural scenery along National Route 385, Aoki Onsen is a hidden day-use onsen facility beloved by onsen enthusiasts.Opened in 2003 and renewed in 2020, it has steadily earned support as a lesser-known gem.
Its greatest commitment is its 100% free-flowing onsen, with no added water.The 65°C source is carefully adjusted to a comfortable bathing temperature through a heat exchanger before flowing generously into the baths.The indoor bath is divided into two tubs with different temperatures—around 43°C near the source inlet, gradually becoming milder as you move away.
The onsen is known for its slightly slippery, distinctive feel, leaving skin moist and smooth after bathing.The water appears yellowish in the morning and lightens by evening—another charm unique to natural onsen.
The facility is kept meticulously clean throughout, ensuring a pleasant and comfortable stay.

Address (Japanese)	830-0291　福岡県久留米市城島町上青木366-1
Telephone Number	0942-62-1426（あおき温泉）
Fax Number	0942-62-1427
Open	10:00–22:00
Closed	Wednesdays (Open if a public holiday)
Price	Day-use bathing: ¥600
Car Park	100 spaces
Access	Approx. 20 min by taxi from Nishitetsu Tenjin Omuta Line Daizenji Station Approx. 20 min from Nagasaki Expressway Higashisefuri IC
Website	Official Instagram account of Aoki Onsen

Spring quality	Sodium chloride / bicarbonate spring
Hot spring components	100% natural spring water
Availability of open-air baths	Yes
Availability of private baths	No
Availability of a sauna	Yes
Pets welcome	Not allowed
Day-trip bathing	Available
Tattoo Acceptance	Not accepted
Payment Method	Cash / QR payments (PayPay only)
Free Wi-Fi	Available
Foreign Language Support	Not accepted