Ryuoh Radon Onsen, Awarded No. 1 in Japan, Celebrates 80th Anniversary Commemorative bathing coupon tickets on sale from February 23

2026.02.05 09:30

株式会社湯ーとぴあ

Yutopia Corporation (Location: Kai City, Yamanashi Prefecture; President: Yoshiteru Hayakawa), which operates the Ryuoh Radon Hot Springs Yutopia, will celebrate its 80th anniversary on February 23, 2026.

80周年記念割引き回数券販売

80th Anniversary Commemorative Discount Ticket Sales

To commemorate the 80th anniversary, a limited number of 80th anniversary commemorative coupon tickets (6 coupons) will be sold at a special price of 4,290 yen (tax included; regular price 5,280 yen) starting on the same day. The facility has been ranked first in Japan for three consecutive years (2019-2021) in the "health promotion" category of the Onsen General Election, and first in Japan for two consecutive years (2023-2024) in the "good hot water" category of the Nifty Onsen Ranking, and is nationally recognized for the high quality of its springs.

■80-year history and commitment to "spring quality

Since its establishment in 1946, the company has been in the building materials business, and in 1975, it drilled for hot springs, and in 1977, it turned to the hot spring business, which it continues to do to this day.

Ryuoh Radon Onsen has continued to pursue the "quality of spring water". As a result, the quality of the springs has been recognized nationwide, winning first place in the "health promotion" category of the Onsen General Election for three consecutive years and first place in the "good hot water" category of the Nifty Onsen Ranking for two consecutive years.

建物全景

Overall view of the building

In recent years, as people have become more health-conscious, more and more are seeking not just relaxation, but the intrinsic appeal of hot springs. As one of the largest radon hot springs in Japan, this facility offers hot springs containing high concentrations of radon. Radon is a naturally occurring noble gas that has long been the focus of attention in the field of onsen therapy. The facility is characterized as a "hot spring that you breathe in," meaning that you can take in radon not only by bathing but also by breathing it in. In addition, the facility has built its own unique hot springs, such as the "hot spring with good hot water" that uses highly concentrated reduced hydrogen water and the "melting purifying hot spring" that is favored by those who are interested in beauty.

■Multiple times awarded first place in the nation, and the highly regarded "triple effect

The greatest feature of Ryuoh Radon Onsen is the "Triple Effect," which is a combination of the following three elements.

ラドン吸入室

Radon inhalation room

ラドン発生器

Radon generator

1. One of the largest radon hot springs in Japan

One of the largest radon generators in Japan is used to create a hot spring containing a high concentration of radon. Radon has long been used in the field of hot spring therapy, and the facility provides an environment where visitors can experience radon through both bathing and breathing.

2. "Hot springs with good hot water" using highly concentrated reduced hydrogen water

By using highly reduced hydrogen water in the hot spring water, we are seeking to create a spa that feels good on the skin. This approach has been highly evaluated, and the spa was ranked No. 1 in Japan in the "good hot water" category of the Nifty Hot Springs Ranking for two consecutive years in 2023 and 2024.

3. Melting Purifying Onsen, a beauty spa

This hot spring is gentle to the skin and enjoys high popularity, especially among female users who are highly interested in beauty.

With these combined features, the facility was also ranked No. 1 in the nation in the "health promotion" category of the Hot Springs General Election for three consecutive years from 2019 to 2021. As a hot spring where one can experience "health, beauty, and healing" at the same time, the facility is also supported by long-term visitors who stay for therapeutic purposes.

Future Prospects

Yoshiteru Hayakawa, president of the company, said, "Since the spa's establishment, we have been supported by local residents and guests from all over the country. We will continue to pursue the quality of the springs and contribute to the physical and mental refreshment of many people through the hot springs. The commemorative coupon tickets were planned in response to customer requests as an opportunity for many people to experience the quality of the facility's springs.

客室からの富士山