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Akazawa Onsen

赤沢日帰り温泉館あかざわひがえりおんせんかん

Ocean-view open-air bathing at a day-use spa complex in Izu

Bathing Complex
Chubu·Shizuoka

Day Use

Yes
10:00–22:00

Last admission is 21:00, an hour before the 22:00 closing time.

¥1,400

A cheaper night rate applies from 18:00: 1,000 yen for adults and 500 yen for children on weekdays, 1,300 yen and 800 yen on weekends and holidays. The Ocean Lounge, Play Lounge and Warm Relaxation Room are a paid extra area, plus 500 yen. Towel rental is 200 yen and yukata rental is 400 yen; children under 4 bathe free. Peak seasons (New Year, Golden Week, summer) are charged at the weekend-holiday rate.

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Sauna room of any kind

Bathing Arrangements

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

TattooWith Conditions

Allows entry with visible tattoos

Up to two stickers (11cm x 20cm)

KidsYes

Welcomes children and families

DiningYes

A restaurant or dining room open to visitors, not only meals for overnight guests

TowelsYes

Towels to rent or borrow at the desk

Rest AreaYes

Relaxation space for after bathing

The rest lounges (Ocean Lounge and Play Lounge) are a paid extra area, +500 yen on top of admission.

ParkingYes

On-site or nearby parking available

Water treatment

Treated and recirculated(partial disclosure)
from Article 18 disclosure
  • Added water
    Yes
  • Reheated
    Yes
  • Recirculated
    Yes
  • Disinfected
    Yes
    塩素系薬剤
  • Bath additives
    Not disclosed

対島76号

Tsushima No. 76 Spring

Operated by · 赤沢日帰り温泉館

Chloride
Strong salt
Known good for
  • Warmingcold sensitivity
  • Smooth skindry, rough skin
  • Cutsminor wounds

A sodium chloride spring rising at seaside Akazawa in Ito. With total dissolved solids of 19.90 g/kg it is a hypersaline strong-salt source exceeding ocean salinity, leaving a mineral film on the skin and retaining warmth well after the bath. It is weakly alkaline and soft on the skin. As the source emerges at 35.5 °C, the water is reheated for bathing.

Analyzed May 24, 2022·一般財団法人静岡県生活科学検査センター

Explore the water

Views

Sea
Mountains

Highlights

Jet Bath
Steam Sauna

About

Akazawa Onsen Day Spa is a large day-use bathhouse on the Izu coast, part of the wider Akazawa resort. The main open-air bath sits right at the edge of the water, so the horizon and the Pacific fill the view while you soak in natural hot-spring water. Indoors there's a jacuzzi, a reclining bath, and two kinds of sauna, including a mist sauna. A restaurant serves Izu seafood after your bath, and there's a souvenir shop and paid lounge areas with manga and board games if you want to make a day of it. Reviews mention the evening view over the water in particular, and describe the place as clean and calm rather than crowded.

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NH
Nadya Ho
5 months ago

Akazawa Day-Use Onsen Hall I visited on a rainy day, so the ocean view from the infinity onsen didn't fully reveal its amazing potential. Nevertheless, both the onsen itself and the view were very impressive. There are no longer private baths after renovation; the men's and women's floors alternate by day. I was surprised that the water was salty. All baths, both indoor and outdoor, were comfortably warm. Inside the onsen, there were two small stone baths, one with green tea and the other with mandarin. There were very few visitors (we went midweek), and I spent a long time alone in the infinity onsen. There is a sauna with a huge window overlooking the ocean and a cold bath at the exit. We purchased the most expensive option, which included towel rental, bath clothing, and lounge access. The lounge is great—lots of spots and nooks to relax, read manga, or nap. There is a large selection of manga and magazines. There is also a children's corner. Entry is via badge everywhere; you cannot pay extra for lounge access on-site as there is a turnstile and no staff. So, it's better to buy the correct tickets at the entrance. Payment is only through a machine, which is only in Japanese—we used Google Translate, and everything was clear. We also had lunch at the restaurant—excellent, fresh fish. Orders are placed via badge, and payment is made at the exit via a machine. I really liked it—the design is cool, and there were very few people. We took a free shuttle from Izu-Kogen there and returned directly to the hotel by local bus (seems it continued to Ito). The schedule is like in a real countryside (see photo), but the empty bus arrived on time. I really want to visit again on a clear day 🙏

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Sergey M
1 year ago

241. Akazawa Onsen Day Spa, Izu An incredibly powerful onsen complex with infinity onsen baths and a mind-blowing view of the bay and coastline. Entry costs 1600–2000, open from 10:00 to 22:00. There's a bus from the nearest station. I arrived right at opening, but there were already visitors in the bath — apparently hotel guests get in earlier. Inside there's a restaurant, chill zones, a shop, massages, and private baths with rooms for 3500–4500 (didn't take them). There are two infinity baths — on the 3rd and 4th floors. They rotate daily. I went on the day when the 3rd floor was open. Online photos match (though the photos don't even come close to capturing how amazing the view is in person). 1. Outdoor infinity bath on the 3rd floor with a top-tier view of the bay and coastline. Clear water, temperature 40. 2. Indoor infinity bath, but the glass had slight fogging, which doesn't give the full view. Clear water, temperature 40. Comfortable to breathe. 3. Inside there are two tubs with greenish water, temperature 38. 4. Sauna. 5. Steam bath. An absolutely amazing place, superb view, great onsen. Need to come back to try the second infinity onsen on the 4th floor and a couple of private baths. Maybe even stay overnight.

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Onsen Oni

Last updated September 19, 2026