Nagasaki · Obama Onsen (Nagasaki)
Obama Onsen Hama-no-Yu Municipal Bath
小浜温泉 雲仙市営共同浴場 浜の湯
Obama Onsen in Unzen, Nagasaki, is famed for sunsets over Tachibana Bay and for spring water near 100°C – the highest heat output of any onsen town in Japan. Hama-no-Yu is the city-run, old-fashioned public bath of this seaside spa: a classic sentō layout with an attendant's booth and two deep tubs, hot and tepid, brimming with alkaline simple spring water. No soap or shampoo is provided (sachets are sold) – there is nothing here but the water, and bath lovers cherish that purity. Admission is an astonishing ¥300 for ages 12 and up from outside the city (Unzen residents ¥150), and ¥100 for ages 6 to under 12; open 6:00–22:00 (last entry 21:30), irregular closures. There is room for some five cars, and the nearby Yūhi-no-Hiroba lot is free. Along the shore are Japan's longest footbath, the 105 m 'Hot Foot 105', and steam cookers, and it is fun to bath-hop to the Wakihama public bath (¥200). About an hour from Isahaya Station by Shimabara Railway and Shimatetsu bus, or an hour by car from Nagasaki city. Taste Unzen's mountain baths and Obama's sea baths in a single day.
- Price (adult)
- ¥300
- Hours
- 06:00–22:00
- Closed
- Irregular
- Access
- About 1 hour from Isahaya Station by Shimabara Railway / Shimatetsu bus to 'Obama', then 5 min on foot; about 1 hour by car from Nagasaki city via Routes 57 and 251; about 45 min by car from Isahaya IC
- Water type
- Alkaline simple
- Tattoos
- Ask ahead
- Admission
- Bathing ages 12 and over ¥300 for those living outside Unzen city / ¥150 for Unzen residents, ages 6 to under 12 ¥100. No soap or shampoo provided (small packets are sold) — bring your own, along with a towel; the lockers have no keys. Cash. A seaside communal bath open from 6 a.m.
- Baths
- Obama Onsen in Unzen, Nagasaki, known for the sun sinking into Tachibana Bay. In this seaside spa town famous for a source temperature of about 100°C and the largest heat output in Japan, the city runs this communal bath, 'Hama-no-Yu'. It is a sentō exactly as it is, with a counter, and its deep tubs come in two kinds — hot and lukewarm — filled generously with alkaline simple spring water. The plainness of having neither soap nor shampoo, only the water, is loved by onsen devotees
- Spring water
- An alkaline simple spring. Obama Onsen is a spa town said to boast a source temperature of about 100°C and the largest heat output in Japan, and its hot water is cooled in tubs around the town so it can be used. At Hama-no-Yu that water is divided between two tubs, hot and lukewarm, so even those who cannot take hot water can stay long in the lukewarm one. The skin turns smooth and the body warms well, and warmth stays long after you get out
- Access & parking
- By car about 40 minutes from Isahaya IC on the Nagasaki Expressway via Routes 34 and 57, about an hour from central Nagasaki, about 50 minutes from Shimabara city. By public transport about an hour from Isahaya Station by Shimabara Railway and Shimatetsu bus. There is parking for some five cars at the facility, and the nearby 'Sunset Plaza' car park can be used free. The 105-metre seaside footbath 'Hott Futt 105', a steam-steaming hut and the Wakihama communal bath (¥200) are all within walking distance
- Phone
- 0957-38-3111
- Official site
- city.unzen.nagasaki.jp ↗
- Open in Google Maps
- Google Maps ↗
Essentials
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Why go
- City bath in a seaside spa with 100°C springs
- Hot and tepid tubs in a classic sentō layout
- ¥300 (¥150 for residents); open 6:00–22:00; sunset & 105 m footbath
100°C water for ¥300
Hama-no-Yu of Obama Onsen is a city-run communal bath in Obama, Unzen, Nagasaki, in a seaside spa town facing Tachibana Bay. Obama Onsen is a spa known for a source temperature of about 100°C and the largest heat output in Japan, and steam rising here and there about the town is an everyday sight. Hama-no-Yu is the old communal bath still standing in that spa town, keeping the sentō arrangement exactly as it was: a counter, then, once you take off your shoes and hand over a ticket, the bathhouse straight ahead. Inside there are two deep tubs — hot and lukewarm — filled generously with alkaline simple spring water. Because water welling at 100°C is cooled before it goes in, the hot tub is very hot, and locals move between it and the lukewarm tub to stay long. Travellers who cannot take hot water should start in the lukewarm tub and shift gradually toward the hot one; that is the standard way to use this onsen. There is no soap or shampoo provided here (small packets are sold). Rinsing the body and then soaking, enjoying the spring water itself, is the original way to use it, and if that bothers you, bring travel soap. The lockers have no keys, so it is wise to keep valuables to a minimum, and the changing room is plain. Rates are ¥300 for those aged 12 and over living outside Unzen city (¥150 for Unzen residents) and ¥100 for ages 6 to under 12 — astonishingly cheap given the quality of the water. Hours are 6 a.m. to 10 p.m. (last entry 9:30 p.m.), closures irregular (there are cleaning closures), and because it opens early it particularly suits those who like a morning bath. There is parking for only some five cars at the facility, so using the nearby 'Sunset Plaza' car park (free) is normal, and on the shore are Japan's longest footbath, the 105-metre 'Hott Futt 105', and a steaming hut that cooks food in onsen steam — good to combine with a bath round. The Wakihama communal bath (¥200) is within walking distance too, so comparing the two is another Obama pleasure.
The hot and lukewarm tubs, and a bath round of Obama
Leave the car in the Sunset Plaza car park (free) and walk along the shore to Hama-no-Yu. Pay at the counter (¥300 from outside the city), take off your shoes and go in; there is no soap or shampoo, so buy a packet if you need one or bring travel soap. A recommended circuit: first 10 minutes in the lukewarm tub — warming the body while learning the feel of the water; rinse lightly if a washing place is free; 3–5 minutes in the hot tub — the time to feel Obama's real temperature; back to the lukewarm tub for 10 minutes; and repeating these three or four sets for a long soak of 40 minutes to an hour is the original way to use this onsen. The alkaline simple spring makes the skin smooth and warms the body well, and because the water is hot the warmth lasts long after you get out. Afterwards rest your feet in the 105-metre seaside footbath 'Hott Futt 105', and put eggs or vegetables into the steam-steaming hut that cooks with onsen steam for a snack — that makes a half day typical of Obama Onsen. The Wakihama communal bath (¥200) within walking distance has a tub of a different character, so comparing them is worthwhile, and in the evening the sun sinking into Tachibana Bay is the town's highlight. Notes: no soap or shampoo provided; the lockers have no keys (mind your valuables); the hot tub is very hot (anyone with a heart condition should not push); irregular closures and cleaning closures (early mornings are quiet); cash only; use the Sunset Plaza car park. With cheap rates, a hot source and a seaside sunset, Hama-no-Yu is one of Kyushu's finest communal baths.
Practical details and an Unzen and Shimabara route
Hours are 6:00–22:00 (last entry 21:30), closures irregular (there are cleaning closures); ages 12 and over ¥300 from outside the city / ¥150 for Unzen residents, ages 6 to under 12 ¥100; parking for five cars at the facility plus the free Sunset Plaza car park. Access is 40 minutes from Isahaya IC, an hour from central Nagasaki, about an hour by bus from Isahaya Station. Suggested routes: (1) a morning in Obama — a bath straight after the 6 a.m. opening, the seaside footbath, then Obama champon for breakfast; (2) the mountains and the sea of Unzen — Unzen Onsen (a round of the hells), Hama-no-Yu at Obama, then the sunset; (3) Shimabara — the castle and samurai houses, Hama-no-Yu, then a ferry from Shimabara Port to Kumamoto; (4) a bath round of three — Hama-no-Yu ¥300, Wakihama communal bath ¥200, another Obama bath; (5) a day trip from Nagasaki — the city, Unzen, Obama, home via Isahaya. Notes: cash only; no soap or shampoo; the lockers have no keys; mind the hot tub; irregular closures (mornings are safest); crowded weekend evenings. Among Kyushu's onsen, Hama-no-Yu is one where the everyday life of an old spa town can still be felt, and it fits well at the morning or evening end of a trip through Unzen and Shimabara.
Before you go
- No official tattoo policy is published — ask at reception.
- As a communal bath there is no soap or shampoo — bring your own or buy at the shop.
- Payment is usually by ticket machine in cash — bring coins.
- Last entry is 30–60 minutes before closing.
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✔ 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
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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.
