Aichi · Miya Onsen, Gamagōri
Miya Onsen Hotel Meizansō
三谷温泉 ホテル明山荘（日帰り入浴）
A large hotel on a rise above Mikawa Bay in Gamagōri, part of Miya Onsen, whose waters are said to have been discovered 1,200 years ago by the monk Kūkai. Unusually for a coastal spa, the low-salt alkaline simple spring is known as 'beautiful-skin water'. Highlights are the open-air hot spring bath Bihakusen and 13 kinds of spa facilities across the men's and women's sides – lie-down baths, waterfall showers, saunas – with views over the bay toward Takeshima island. Day bathing runs 11:30–19:00 for ¥1,600 per adult (face towel ¥200 and bath towel ¥300 extra). Prices have risen, but the spacious halls and views are often yours alone in quiet hours; day plans with meals and private rest rooms are offered. Open every day, with free parking for 200 cars. About 5 minutes by car (20 on foot) from Mikawa-Miya Station on the JR Tōkaidō Line, or 20 minutes from the Otowa-Gamagōri IC on the Tōmei Expressway. Combine with Laguna Ten Bosch, Takeshima or mandarin picking on a Mikawa Bay drive.
- Price (adult)
- ¥1,600
- Hours
- 12:00–19:00 (reception) — Saturdays from 15:00 due to maintenance
- Closed
- Irregular
- Access
- About 5 min by car (20 min on foot) from Mikawa-Miya Station (JR Tōkaidō Line); about 20 min by car from Otowa-Gamagōri IC on the Tōmei Expressway; about 10 min by taxi from Meitetsu Gamagōri Station
- Water type
- Alkaline simple
- Tattoos
- Ask ahead
- Admission
- Day bathing: adults ¥1,600 / elementary ¥1,000 / preschool (3–5) ¥800, face towel included. Bath-towel rental ¥300. Book of 11 tickets ¥12,000. Lunch-buffet-plus-bath plans available (from ¥6,000 on weekdays)
- Baths
- 'Seven baths overlooking Mikawa Bay' — the Kobo-no-yu bathhouse offers a carbonated bath (high-concentration artificial CO₂), jets, lie-down baths, sauna and more: 13 spa features across the two sides, plus a roofed, garden-style rotenburo. Sides swap each morning. A large bathhouse for 180 people
- Water
- Two sources marketed as 'Bihakusen' (whitening spring): an alkaline simple hot spring plus a simple weakly radioactive (natural radon) spring. Colourless, soft on the skin — a 'beauty bath' type that smooths dead skin. Recirculated and heated
- Parking & access
- Free parking for 150 cars. 5 min by taxi from JR Mikawa-Miya Station (free shuttle available — confirm). About 20 min from the Otowa-Gamagori Road ('Orange Road'). 3 min by car to Laguna Ten Bosch
- Phone
- 0533-68-4641
- Official site
- meizanso.com ↗
- 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
- Hilltop open-air bath Bihakusen over Mikawa Bay
- 13 spa facilities and a 1,200-year-old 'beauty' spring
- ¥1,600 day bathing, 11:30–19:00, open daily
A carbonated bath, a radon spring and Mikawa Bay views — Miya Onsen's 'seven-bath circuit' next door to Laguna
Hotel Meizanso is a large hot-spring hotel of Miya Onsen on a rise within Mikawa Bay Quasi-National Park in Gamagori, Aichi, with the bay below and the Chita Peninsula beyond. Its pride is a pair of sources branded 'Bihakusen' (whitening spring): an alkaline simple hot spring and a simple weakly radioactive spring containing natural radon — colourless, soft, and leaving the skin noticeably smooth. The Kobo-no-yu bathhouse runs from a carbonated bath that coats the body in fine bubbles (a therapy once called the 'heart bath' in Europe) through jets, lie-down baths and sauna — 13 spa features across both sides — to a roofed, garden-style rotenburo, so the hotel's advertised 'seven-bath circuit' costs ¥1,600 with a face towel. Day plans that add the open-kitchen restaurant's Mikawa Bay seafood buffet are popular, and with the Laguna Ten Bosch theme park three minutes away by car, it makes a natural end to a family outing. True to its anti-ageing, local-produce concept, the post-bath lounge is panelled in Mikawa cedar and serves seven kinds of health tea.
Tips & notes
① Day reception runs 12:00–19:00 (per the official LINE), from 15:00 on Saturdays due to maintenance — no weekend mornings. Some accommodation listings say 11:30, so phone on the day (0533-68-4641). ② Sides swap each morning, so the rotenburo layout you get may differ. ③ The carbonated bath is meant to feel lukewarm (it dilates blood vessels) — soak 10 minutes or more. ④ Radon works largely by inhalation, so breathe easy in the sauna and steam. ⑤ ¥1,600 is on the high side, but ticket books, lunch sets and coupons (e.g. ¥300 off) appear often.
Getting there
From Nagoya, JR Tokaido Line special-rapid or rapid trains reach Gamagori in about 40 min; one more stop to Mikawa-Miya, then 5 min by taxi (the hotel also runs a free shuttle — reserve). By car: Tomei Otowa-Gamagori IC → Orange Road → Route 23 bypass towards Miya, about 20 min, or about 25 min from Toyokawa IC. Free parking for 150 cars. Works either as an overnight in Gamagori with Laguna Ten Bosch and Takeshima, or as a day trip from Nagoya.
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
Sauna & wellness
Mood & scenery
Price
Who with
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
Canal Resort Nagoya
Nagoya's largest bath complex, about 10,000 m² along the Nakagawa Canal. A tropical-resort layout with natural hot-spring rotenburo, a main sauna with auto-löyly every ten minutes, a 2-m-deep cold plunge and a big outdoor cool-down deck — sauna fans rate it highly. The separately ticketed 'TERA SPA' stone-sauna zone adds barrel saunas. ¥900 weekdays; open until 3 am on Fridays and Saturdays. 25 minutes by bus from Nagoya Station.
Minami-Chita Onsen Ume-no-yu
The only communal bath in the Minami-Chita hot-spring area, near Toyohama fishing port at the tip of the Chita Peninsula. Salty chloride water from the most abundant springs in Aichi for just ¥700. While the ryokan charge ¥1,000–1,650 for limited midday hours, this one is open straight through 10:00–21:00. Handy after the Toyohama fish market or a day's fishing. 25 minutes by bus from Meitetsu Kowa Station.
Minami-Chita Onsen Sankaikan
About 90 minutes from Nagoya by train and car, an inn on the Sankai coast at the southern tip of the Chita Peninsula. Day visitors can use the rotenburo and main bath with sweeping views of Ise Bay — sunset over the water is the highlight. The chloride spring of Minami-Chita, Aichi's most abundant hot-spring area, keeps you warm afterwards. ¥800, 11:00–21:00; towels sold for ¥200. Pair with the beach in summer or fugu dinners in winter.
