Oarai Onsen: Day-Use Hot Spring Baths & Prices (Ibaraki)

Oarai Onsen springs up in the port town of Oarai on the Pacific coast, near the center of Ibaraki Prefecture. Many inns let you watch the sunrise climb over the horizon straight from the bath, and the sodium chloride water, salty in nature, is said to warm you deeply. The scent of the sea drifts through every soak.

Highlights

The torii gate on the sea rocks at Oarai Isosaki Shrine, washed by crashing waves, is a famous and almost sacred sight, also renowned as a spot for the first sunrise of the year. The prefectures largest aquarium, Aqua World Oarai, and the Oarai Marine Tower with its observation deck 60 meters up are close by, so you can pair bathing with sightseeing in a single day.

Enjoying the Seasons

Spring brings clam digging, and summer draws swimmers to Oarai Sun Beach, chosen among Japans finest bathing beaches. From autumn into winter, rich anglerfish dishes are the specialty, and the Oarai Anglerfish Festival is held each November. The first sunrise of the year, seen through the torii in the clear winter air, is truly special.

Access and Basic Information

The nearest station is Oarai on the Kashima Rinkai Railways Oarai Kashima Line, and you reach the shore on foot, by bus, or by rental bicycle. By car it is about fifteen minutes from the Mito Oarai interchange on the Kita Kanto Expressway. The water is a sodium chloride spring, and day use facilities such as the Yukkura Kenkokan are available. Some lodgings welcome day visitors, with fees and hours varying by facility, so checking ahead is best.

Practical Travel Notes

Best are the early hours, when the sun rises through the sea rock torii, and roughly November to February, when anglerfish is in season. Choose summer for swimming, and weekdays to avoid crowds. You can round out the day with Aqua World Oarai (about half a day), the Oarai Marine Tower, and the sea rock torii. Since the walkable area is wide, a rental bicycle is handy. Budget wise, the aquarium costs around two thousand yen and day bathing runs from a few hundred to the low thousands of yen.

A Quick Tip

For dinner, choosing seasonal anglerfish or fresh shellfish makes the meal far more rewarding. If you want to catch the sunrise, book an east facing room. The first sunrise at the sea rock torii draws large crowds, so aim to arrive early.

Practical Information for Your Visit

• Spring quality (Shiosai no Yu): The source is named Oarai Sun Beach Onsen, a sodium chloride strong salt hot spring
• Indications (Shiosai no Yu): Chiefly chronic skin conditions, cuts, burns, delicate constitutions in children and chronic women's ailments. Also neuralgia, muscle pain, joint pain, frozen shoulder, stiffness in the joints, bruises, sprains, chronic digestive complaints, haemorrhoids, sensitivity to cold, convalescence after illness, recovery from fatigue and general health promotion
• Source temperature: Oarai Onsen is 14.8 degrees (Oarai Tourism Association), and the source at Yukkura Kenko-kan is 15 degrees (the facility's official information). Both are low-temperature springs and are therefore heated before use
• Handling of the water: At Shiosai no Yu, the open-air view bath and the jet and bubble bath use natural hot spring water. The high-concentration carbonated bath is officially stated to be an artificial hot spring produced by an artificial hot spring generator
• Open-air bath: Shiosai no Yu has them: the open-air view baths Kuroshio no Yu for men and Oyashio no Yu for women
• Hours for day-use bathing (Shiosai no Yu): 10:00-21:30 (last entry to the building 20:30)
• Closed days at Shiosai no Yu: From April of Reiwa 8 it is open all year round (with occasional irregular closures)
• Bathing fees at Shiosai no Yu: On weekdays, 1,000 yen for adults (junior high school age and above) and 600 yen for children (age 4 to primary school age); on Saturdays, Sundays and public holidays, 1,200 yen for adults and 700 yen for children; on special holidays (New Year, Obon and Golden Week), 1,400 yen for adults and 800 yen for children
• Private rooms at Shiosai no Yu: Six-tatami-mat rooms looking out over the Pacific Ocean can be hired by the hour. 1,200 yen on weekdays, 1,400 yen on Saturdays, Sundays and public holidays, and 1,600 yen on special holidays (no bath included)
• Tattoos at Shiosai no Yu: People with tattoos are refused entry and use of the facility
• Payment at Shiosai no Yu: As well as cash, credit cards, electronic money and PayPay can be used (some payment methods are not accepted)
• Facilities at Shiosai no Yu: A lie-down area, a resting room, a souvenir corner, a games corner and a view restaurant seating 230 people (10:00-20:40, last orders 20:00). The body care room is open 11:00-20:00 (last reception 19:00), with body care from 1,980 yen for 20 minutes
• Access to Shiosai no Yu: About 5 minutes by taxi from Oarai Station on the Oarai Kashima Line. By car it is about 8 minutes from the Mito-Oarai IC on the Kita-Kanto Expressway. The address is 256-25 Onuki, Oarai Town, Higashi-Ibaraki District, Ibaraki Prefecture
• Hours and closed days at Yukkura Kenko-kan: 10:00-21:00 (until 21:30 on Saturdays, with last entry 45 minutes before closing). Closed every Thursday (the following day when Thursday is a public holiday) and from 7 to 13 January
• Bathing fees at Yukkura Kenko-kan: For adults, 800 yen from 10:00 to 17:00 and 600 yen after 17:00. For children (age 3 and over but under 12), 400 yen and 300 yen respectively
• Tattoos at Yukkura Kenko-kan: People with tattoos are refused use of the facility
• Access to Yukkura Kenko-kan: About 15 minutes from the Mito-Oarai IC via National Route 51. From Oarai Station it is 5 minutes by bus or a 20-minute walk. The address is 26-1 Minato-chuo, Oarai Town. A free shuttle bus has been running since July 2026
• Taking the hot spring water home: There is a hot spring water stand in Onuki-cho, where you can buy 30 litres for 10 yen or 300 litres for 100 yen
• How long to allow: One to two hours if you are just bathing. Allow half a day to be comfortable if you also use the restaurant and the resting areas
• Avoiding the crowds: Bathing fees also rise on Saturdays, Sundays and public holidays, so weekday mornings are the calmest time

Information Sources

The opening hours, bathing fees, private room charges, the policy on tattoos, the payment methods, the spring quality, the source name and the access details were confirmed on the Guide to Using the Facility, Hot Spring and Baths, Facilities and Access pages of the official Shiosai no Yu website. The opening hours, closed days, fees, source temperature and access details for Yukkura Kenko-kan are from the About Us and Access pages of that facility's official website. The source temperature of 14.8 degrees for Oarai Onsen, the prices at the hot spring water stand and the information on inns that pipe in the hot spring water are from a feature page by the Oarai Tourism Association. The dates of the monkfish festival are from information provided by the Oarai Town Society of Commerce and Industry. Details are subject to change, so please check the official information before you set out.