Nagasaki · Nagasaki city & Mt Inasa
Nomon-yu Natural Carbonated Onsen
天然炭酸温泉 のもん湯
A high-concentration carbonated spring at the tip of Nomozaki. Above 1,000 ppm of carbon dioxide, with a panoramic great bath facing Gunkanjima for sunsets and starry skies. ¥780 on weekdays.
- Price (adult)
- ¥780
- Hours
- 10:00–21:00 (last entry 20:30)
- Closed
- 3rd Wednesday
- Access
- ~40 min by car from central Nagasaki; ~40 min from Nagasaki IC via Route 499
- Water type
- Bicarbonate spring
- Tattoos
- Ask ahead
- Spring
- An iron- and carbon-dioxide-bearing magnesium–calcium bicarbonate spring, above 1,000 ppm carbon dioxide with about 176 mg of metasilicic acid.
- Admission
- Adults ¥780 and children ¥420 on weekdays; ¥880 and ¥480 on weekends and holidays (tax included). Children are aged 3 to elementary school.
- Facilities
- There is no open-air or family bath; both a heated tub and a free-flowing source tub are available. Body soap and shampoo are provided, towels ¥220. Cash only.
- Phone
- 095-893-1126
- Official site
- nomon-yu.jp ↗
- Open in Google Maps
- Google Maps ↗
Essentials
Find a stay on Trip.com
Search and book accommodation across Japan on Trip.com. Day-use bathing needs no booking.
Opens partner booking site (affiliate)
Why go
- Carbonated spring above 1,000 ppm
- Panoramic great bath facing Gunkanjima
- Both free-flowing and circulated tubs
A high-concentration carbonated spring facing Gunkanjima
Nomon-yu stands near the tip of Nomozaki in Nagasaki, its glass-fronted great bath commanding views of the Gotonada sea and Gunkanjima. At over 1,000 ppm of carbon dioxide it is a rare high-concentration carbonated spring, rich in metasilicic acid, the substance called nature's lotion. Two tubs, one heated and one free-flowing from the source, let you soak while watching the sunset or the stars.
Tips and cautions
Open 10:00 to 21:00 with last entry at 20:30, closed the third Wednesday of each month. With no open-air or family bath and the sauna suspended, use centres on the great bath. Payment is cash only, so cards and e-money will not work. It is about 40 minutes by car from central Nagasaki, which pairs well with the Nomozaki dinosaur museum or the Wedded Rocks for a half-day itinerary.
Before you go
- No official tattoo policy is published — ask at reception.
- Payment is usually by ticket machine in cash — bring coins.
- Last entry is 30–60 minutes before closing.
Features
Mood & scenery
Convenience
Who with
Price
Amenities
✔ Verified operating: 2026-10 Operating status and rates cross-checked against the official site and onsen guides (full source notes in Japanese on the JA page)
Prices and hours change. Check official sources before visiting.
More in this area
Unzen Kojigoku Onsen-kan
A historic cure-bath in the hills a short way from Unzen's main street, said to have hosted Siebold and Yoshida Shōin. An octagonal wooden bathhouse with milky sulfur water cooled from a 90°C source. No open-air bath, but Unzen's finest water.
Unzen Yokayu
A day-bath with a simple lodging near the entrance to Unzen Jigoku. Every tub is free-flowing milky sulfur water — indoor, open-air and four private outdoor baths. ¥500, 9 am to 9 pm; an easy stop before or after touring the 'hells'.
Obama Onsen Wakihama Public Bath (Otasshan-yu)
A communal bath in Obama Onsen on Tachibana Bay, whose ~100°C springs release more heat than any in Japan. The single-storey wooden building from 1937 feels like a museum of Showa-era life and is a designated prefectural townscape asset. Pay at the old-style counter, then choose between the hot and very hot tubs of free-flowing chloride water. Open from 6 am; part of the Kyushu 88 Onsen trail. About an hour from Nagasaki city, on the way back from Unzen.
