Gunma · Manza Onsen
Manza Onsen Nisshinkan
万座温泉 日進舘
At 1,800 m, one of Japan's highest onsen. Milky water with some of the country's highest sulfur content, across nine tubs. Day use 10:00–17:00; prices rise in peak season.
- Price (adult)
- ¥1,000
- Hours
- Day use 10:00–17:00 (last entry 16:00)
- Closed
- Open daily
- Access
- 45 min by bus from JR Manza-Kazawaguchi Station
- Water type
- Sulfur spring
- Tattoos
- Ask ahead
- Admission
- Adults ¥1,000 (face towel included) / children ¥700. Day visitors may use the main-building “Choju-no-yu” and the outdoor “Gokuraku-yu” (the annex “Manten-no-yu” is guests only). Manza yu-meguri pass accepted (¥700 for day visitors, then ¥500 per bath)
- Baths
- “Choju-no-yu”: an all-hinoki timber hall with thick pillars on temple-style footings, six tubs including Manza’s oldest “Niga-yu” (bitter bath), Uba-yu, Niga-uba-yu, bamboo-leaf bath and a radium source, some 100 % undiluted, plus a roofed semi-open bath. “Gokuraku-yu”: a detached panoramic rotenburo 1–3 minutes’ walk outside the main building, looking to the Shirane range and the night sky. Day visitors get two of the nine baths
- Water
- Acidic sulphur-bearing magnesium-sodium sulphate spring (hydrogen-sulphide type), ~69 °C, pH 2.4, blending five sources (radium Hokko-sen, Tetsu-yu No.1, Niga-yu No.3, Uba-yu etc.). Milky water with among Manza’s highest sulphur levels, naturally rising and free-flowing; ~5.4 million litres a day
- Parking
- 100 free spaces. 5 min on foot from the “Manza Onsen-kami” bus stop
- Phone
- 0279-97-3131
- Official site
- manza.co.jp ↗
- Open in Google Maps
- Google Maps ↗
Essentials
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Why go
- 'Gokuraku-yu' open-air bath above the clouds at 1,800 m
- Top-class sulfur content
- Snow views in winter, stars in summer
Manza’s oldest “bitter bath” and the detached panoramic rotenburo Gokuraku-yu
Nisshinkan (formerly Manza Onsen Hotel) is an old inn that shares top billing with Manza Prince Hotel and shows off Manza’s 5.4-million-litre-a-day springs in the greatest variety. The main-building “Choju-no-yu” is an all-hinoki timber hall with thick pillars on temple-style footings; around the tub of Manza’s oldest source, “Niga-yu”, sit six tubs — Uba-yu, Niga-uba-yu, a bamboo-leaf bath, a radium source and more — letting you compare the strength and feel of each. Then there is “Gokuraku-yu”, a detached panoramic rotenburo a short walk outside the main building, facing the Shirane range from 1,800 m — Manza’s signature view, famed for snow and starlit bathing. Day visitors get both for ¥1,000 including a towel, the best-value day rate in Manza, and the sulphur scent hits you in the lobby. At pH 2.4 the milky water is strongly acidic: short dips, repeated.
Tips & cautions
- Day-use reception until 16:00 (leave by 17:00). Busy when tour buses arrive.
- Gokuraku-yu means walking outside — snowy paths in winter; take care in slippers and yukata.
- Strongly acidic: stings cuts, tarnishes silver and copper; mind contact lenses.
- 1,800 m altitude: long soaks bring dizziness; never after alcohol.
- The annex “Manten-no-yu” is guests only.
- The ¥700 yu-meguri pass lets you add Manza Kogen and Prince hotels.
- Tattoo policy not stated — phone ahead.
Getting there
Seibu Kanko bus ~40 min from Manza-Kazawaguchi Station (JR Agatsuma line) to “Manza Onsen-kami”, then 5 min on foot (Hoshimata Manza Onsen 2401, Tsumagoi-mura). Manza Highway bus ~1 h 45 min from Karuizawa Shinkansen station. By car ~1 h 40 min from Usui-Karuizawa IC (Manza Highway toll); 100 free spaces. Tel. 0279-97-3131.
Before you go
- No official tattoo policy is published — ask at reception.
- Ryokan day-use hours are limited and may be suspended in peak season — phone the same morning.
- Last entry is 30–60 minutes before closing.
Features
Mood & scenery
Convenience
Amenities
✔ Verified operating: 2026-09 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
Sainokawara Open-Air Bath
A 10-minute walk west of Kusatsu's Yubatake, at the far end of Sainokawara Park, lies one of Japan's largest open-air baths. Around 500 m² of pool brims with strongly acidic water, open to the surrounding forest. Snow in winter, fresh green in summer, illuminations at night. There are no washing stations — this is purely for soaking.
Otakinoyu
A large day facility where you can try Kusatsu's traditional 'awase-yu' — a row of wooden tubs at rising temperatures, entered in order. Indoor baths, rotenburo, sauna, plus rest and dining areas make it good for half a day. About 10 minutes' walk from the Yubatake, or a short bus ride. Admission ¥1,200 (2026); three-bath pass with Gozanoyu and Sainokawara ¥2,100.
Gozanoyu
Right in front of the Yubatake, a wooden recreation of the Edo–Meiji communal baths. Wood and stone bath halls alternate between men and women daily, with two sources (Yubatake and Bandaiko). The upstairs hall looks down on the Yubatake.
