This translation was prepared with AI assistance and reviewed by the editorial team.
Kosen is a small day-use bath in Harazuru Onsen, Asakura. It is a straightforward place for enjoying source-fed hot-spring water in one indoor bath for each gender, rather than a resort with many pools and entertainment facilities.
Adult admission is ¥600 and children from infancy are ¥300. It is normally open 10:00–19:00 and closed every Wednesday. Call before a long trip because small independent baths may make temporary changes.
- Adults age 13+ ¥600; children including infants ¥300
- 10:00–19:00; closed Wednesday
- One indoor bath and washing area for each gender
- No open-air bath, sauna, cold bath or private family bath
Prices, hours and facility details were checked through the Harazuru Onsen Ryokan Association information available on August 3, 2026.
Price, hours and contact
| Item | Details | Note |
|---|---|---|
| Admission | Adult ¥600; child ¥300 | Child price applies from age 0 |
| Hours | 10:00–19:00 | Confirm temporary changes |
| Closed | Wednesday | Call around holidays |
| Day rest | 10:00–16:00; ¥1,500 | Food may be brought in; confirm conditions |
| Address | 1870-3 Hakikugumiya, Asakura | Harazuru Onsen area |
| Phone | 0946-62-0715 | Japanese support is most likely |
What the bath is like
The bathhouse has a calm, traditional atmosphere and is used by local residents as well as visitors. There is one indoor bath and a washing area on each side. Choose it for the water itself and a short stop, not for multiple baths or a full-day spa experience.
Follow normal Japanese bath etiquette: wash before entering, keep towels out of the tub and speak quietly. Ask in advance about tattoos rather than assuming admission.
Source-fed Harazuru water
Official tourism information describes Kosen as a natural, continuously flowing bath with a smooth, slippery feel. Harazuru is known for both mildly alkaline simple spring water and simple sulfur spring water, often promoted locally as a ‘double beauty bath.’
Water temperature feels different to each person. If it feels hot, use shorter intervals, rest and drink water rather than staying in too long.
Day rest and what is not provided
A day-rest option is listed from 10:00 to 16:00 for ¥1,500, with outside food permitted. Confirm exactly what the charge includes before using it.
There is no outdoor bath, sauna, cold plunge or private family bath. Bring or confirm toiletries and towels. Travellers who need a private bath or meal should compare other Harazuru inns.
Access from Fukuoka, Asakura and Ukiha
By car, Kosen is about five minutes from Haki IC and about ten minutes from Asakura IC on the Oita Expressway. By public transport, a taxi takes roughly ten minutes from JR Chikugo-Yoshii Station or five minutes from the Nishitetsu express-bus Haki stop.
Parking instructions may not be obvious from the street. Phone before arrival for the current parking place, especially at busy times.
Official checks and nearby onsen guides
The ryokan association page is the reference for basic conditions; the map link helps confirm the exact building. Compare the Harazuru day-bath guide if you need an outdoor bath, private room or accommodation.
