Unzen Onsen Day-Use Baths: Sulphur Springs, Private Rooms and Local Bathhouses
Compare Unzen’s milky sulphur bath, private family room, forest ryokan bath and ¥200 local bathhouses by price, access and bathing style.
Checked: September 27, 2026
Unzen’s bathing options sit in more than one part of the resort area. The milky water at Kojigoku, a private bath at Yokayu and the low-cost neighbourhood bathhouses solve different problems. Build the day around one main bath, then add a second only if the locations and opening times line up.
| If you want… | Start with… | Adult admission |
|---|---|---|
| Milky sulphur water in a traditional bathhouse | Kojigoku Onsenkan | ¥500 |
| A private family bath without a ryokan day-use package | Unzen Yokayu | ¥550 public bath, plus ¥1,400 per private room for one hour |
| A forest-side outdoor bath and ryokan facilities | Seiunsou | ¥880 |
| The least expensive local public bath | Shin-yu or Yunosato | ¥200 |
Kojigoku Onsenkan: a focused sulphur-water stop
Kojigoku’s indoor bath is known for its milky, sulphurous water. There is no outdoor bath, private room or sauna.
| Kojigoku Onsenkan | Terms |
|---|---|
| Hours | 9:30 a.m.–7 p.m. |
| Wednesday | Closed unless it is a public holiday |
| Adult admission | ¥500 |
| Child admission | ¥250; under 3 free |
Yokayu: straightforward private-room pricing
Unzen Yokayu has indoor and outdoor public baths, plus a private family bath. The property’s current rate page lists the public bath at ¥550 for adults and ¥250 for children. A one-hour private room costs ¥1,400, with the same per-person admission added; two adults therefore come to ¥2,500 in total. Confirm the room is available before travelling if a private soak is essential.
The outdoor setting is a draw, but the private-room charge should not be confused with admission: it is an additional room fee, not an all-in price for the group.
Seiunsou: pay more for a fuller ryokan setting
Seiunsou’s forest-side outdoor bath and indoor baths use the property’s spring water. Day visitors do not need an advance reservation; request the private bath at the front desk. Last private-bath reception is 5 p.m.
| Seiunsou day-use | Terms |
|---|---|
| Bathing hours | 11 a.m.–6 p.m. |
| Adult admission | ¥880 |
| Child admission (through elementary school) | ¥440 |
| Age 3 and younger | Free |
| Private bath | ¥2,500 for 50 minutes, plus admission per person |
For two adults, Seiunsou’s private-bath fee plus admission totals ¥4,260 before extras. Yokayu costs less if a private room is the main requirement. School groups are scheduled to use Seiunsou’s indoor baths and private bath at certain times on September 29 and 30, 2026; its outdoor bath is expected to remain open. Ask Seiunsou about day-use access on either date.
Shin-yu and Yunosato: bring coins and check the weekday
Both local bathhouses charge ¥200 for adults and ¥100 for children, and neither has a private bath or outdoor pool. Shin-yu is open 9 am–10 pm and closes Wednesdays. Yunosato keeps the same hours but closes Tuesdays. Yunosato is tucked behind the shopping street, near the Bessho-guchi bus stop.
These are small community baths, not resort facilities. The low price is the reason to go; do not expect the amenities available at a hotel. Unzen’s tourism association cautions that temporary closures and schedule changes can happen, so confirm before heading over.
Tattoos and a realistic day plan
The current listings do not give one tattoo policy that can safely be applied to all five facilities. Ask the bath you plan to use before setting out, especially if you rely on a cover-up or need a private room. A shared-bath listing is not proof that every tattoo is accepted.
For a short visit, choose one main bath and leave time for the walk or bus connection. Kojigoku works best earlier in the day; Yokayu is the practical pick when a private room matters; Seiunsou suits a longer stop if you also want its public baths and rest area. The ¥200 bathhouses are easiest to add when you are already in the central district.
Allow roughly 60–90 minutes at a bath if you want time to change and rest, then count transport separately. That is a planning allowance, not a required bathing time.
If you only have an hour in Unzen, do not spend it crossing between the centre and Kojigoku just to collect more baths. Pick the option closest to your route and check its current hours first.
For another perspective on how spring-source readings differ from bathing-pool temperatures, see how to read onsen water temperatures.
