HOTELOOSADO

A hot spring resort with stunning open-air baths overlooking the sunset and fishing fires floating on the Sea of Japan

Niigata Sado City

"HOTEL OOSADO" is a long-established hot spring resort hotel with over half a century of history, standing in the scenic Kasugazaki area of Aikawa, Sado City, Niigata Prefecture. All guest rooms offer ocean views, allowing you to enjoy sweeping panoramas of the Sea of Japan and beautiful sunsets sinking below the horizon right from your room. In the large public bath, you can fully enjoy Kasugazaki Onsen, blessed with abundant natural waters, in the open-air bath and spacious indoor bath. It also features a compact dry sauna gently heated by an electric stove, as well as a bathtub-style cold plunge bath set in the open-air area. Together with three unique private open-air baths and a foot bath terrace, it offers an exquisite stay where you can savor Sado's fresh mountain and seafood delicacies.

Hot Spring & Bath Information

Large Public Bath

TypeNatural Hot Spring

Kasugazaki Onsen is a natural hot spring overflowing with abundant blessings. Because it contains sodium and salt, it delivers a high bathing effect, and the warmth after bathing lasts surprisingly long, helping relieve chill and fatigue. From the large windows of the large public bath or the open-air bath where you can feel the sea breeze directly, you can enjoy a blissful soak while gazing at the rough waves of the Sea of Japan, the beautiful sunset, and, at night, the fantastical fishing fires.

Private Open-Air Bath

TypeNatural Hot Spring

Three unique private open-air baths add color to your stay: Tairabune no Yu, Akadamaishi no Yu, and Atebi no Yu. These baths also use the abundant natural waters of Kasugazaki Onsen, the same as the large public bath, allowing you to enjoy a private soak without being disturbed by anyone. In a tasteful space inspired by Sado's famous products and traditional culture, you can luxuriate in exclusive views of the sea while soothing both body and mind.

Sauna

Dry Sauna

90°C

Sauna TypeDry Sauna

Stove TypeConvection Stove (Sauna Stone)

Capacity4people

Men'sWomen's

A compact sauna located inside the large public bath. The wood has a beautiful character, and you can slowly work up a sweat while being soothed by its calm woody aroma. Heated by an electric stove, the room is filled with a mild, gentle warmth that gradually warms your body from deep within. In the quiet atmosphere, you can forget the hustle and bustle of everyday life and enjoy a relaxing time.

Cold Bath

Cold Bath

18°C

Water QualityTap Water

Capacity1people

Men'sWomen's

A distinctive bathtub-style cold bath specially installed in the open-air bath area. It uses tap water, and you can adjust the temperature and freshness by adding water yourself from the faucet. This luxurious spot lets you cool down while taking in the pleasant sea breeze of the Sea of Japan, the magnificent scenery, and, in the evening, the crimson sky. The cooling sensation is gentle, softly refreshing and tightening your whole body after the sauna.

Business Hours

Monday
15:00〜00:00
05:00〜10:00
Tuesday
15:00〜00:00
05:00〜10:00
Wednesday
15:00〜00:00
05:00〜10:00
Thursday
15:00〜00:00
05:00〜10:00
Friday
15:00〜00:00
05:00〜10:00
Saturday
15:00〜00:00
05:00〜10:00
Sunday
15:00〜00:00
05:00〜10:00
Holiday
15:00〜00:00
05:00〜10:00
💡 [Day-use bathing] 15:00–20:00 (last admission 19:00)

Closed Days: None

Address

288-2 Kashiwabu, Aikawa, Sado City, Niigata Prefecture 952-1583

View on Google Maps

Website

https://hotel-oosado.jp/
Hotel & RyokanOnsen & Spa Facilities (Super Sento, Sauna, Spa)

Gender Access

Gender Separated

❓
Tattoos in the Communal Bath
Unknown (Please Check)

The above applies to the communal (shared) baths. At facilities with private baths or private saunas, guests with tattoos may still be able to bathe. Please check with the facility for details.

Premium Magazine

Japan's Must-Visit Finest Onsen & Sauna Facilities

Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.

Learn more