Yakushi Onsen is a historic hot spring in Higashiagatsuma Town, Agatsuma District, Gunma Prefecture. Nestled in the mountains of Mount Asama-Kakushi, it lies along the valley of the Nurukawa River, a tributary of the Agatsuma River.
Surrounded by peaceful mountain scenery, Yakushi Onsen is a place where visitors can enjoy a traditional Japanese hot spring experience while discovering historic architecture, local culture, and the natural beauty of a quiet mountain village.
Yakushi Onsen is one of the destinations that make up the Asamakakushi Onsenkyo. Nearby Hato-no-Yu Onsen is another historic hot spring in the same group. Together, these secluded hot springs offer a glimpse into the traditional culture of Japanese mountain retreats.
The history of Yakushi Onsen dates back more than 200 years. The spring is traditionally said to have been discovered in 1793, during the Edo period, by a traveling ascetic who came upon the hot spring in the mountains.
At that time, there were no buildings like those seen today, and the naturally emerging spring was used as an outdoor bath. Yakushi Onsen and nearby Hato-no-Yu were once regarded as part of the same bathing area, and the spring was reportedly known as “Hōin-no-Yu.”
In 1930, a government official named Hikozaburō Ikoma developed a bathing facility here and gave it the name Yakushi Onsen. It subsequently became a popular destination for tōji, the traditional Japanese practice of staying at a hot spring for rest and recuperation.
The main accommodation at Yakushi Onsen is Kayabuki-no-Sato Yakushi Onsen Hatago, a traditional Japanese hot spring inn spread across a vast site of approximately 7,000 tsubo.
Historic thatched-roof houses relocated from different parts of Japan stand throughout the grounds, creating a village-like landscape that feels as though visitors have stepped into an earlier period of Japanese history.
After passing through the impressive thatched-roof Nagayamon gate, guests encounter traditional houses, buildings containing irori hearths, and displays of historic household objects. Simply walking through the grounds provides an immersive introduction to old Japanese village life.
Although it is a hot spring inn, the complex also functions almost like an open-air museum of Japanese history and culture, with numerous sights to discover throughout the grounds.
The village contains numerous traditional houses relocated from different parts of Japan. These were once actual homes where people lived, and their structures preserve the craftsmanship and practical knowledge of earlier generations.
Inside the buildings, visitors can see displays of traditional chests, household tools, folk toys, and other objects. Some exhibits include furniture and crafts dating from the Edo period, offering a close look at everyday Japanese life in earlier centuries.
The village was created with the aim of preserving this traditional culture and passing it on to future generations. Visitors can explore the buildings at a relaxed pace while experiencing the warmth and character of Japan’s historic rural culture.
The spring at Yakushi Onsen is a sodium-calcium chloride-sulfate spring, with a source temperature of approximately 40.8°C. The natural spring water is used directly in the baths in a free-flowing, source-fed bathing system.
The water has a gentle feel on the skin and provides a comfortable, enveloping bathing experience. The spring has long been used as a traditional hot spring retreat, and its commonly cited benefits include relief from neuralgia, muscle pain, and fatigue, as well as skin-care benefits.
Since the Edo period, the spring has also sometimes been used as a “finishing bath” after visiting Kusatsu Onsen, offering a gentler bathing experience after the strongly acidic waters for which Kusatsu is famous.
One of the signature attractions of Yakushi Onsen is Takimi-no-Yu, an open-air bath where guests can soak while looking toward a waterfall on the Nurukawa River.
The view changes beautifully with the seasons. Fresh greenery fills the valley in spring and summer, autumn brings colorful foliage, and winter creates a snowy mountain landscape. At night, the area is illuminated, creating a particularly atmospheric setting for bathing.
Relaxing in the natural hot spring while watching the flowing water and surrounding mountains provides a strong sense of being immersed in nature.
The facility also has a spacious indoor bath called Yakushi-no-Yu, where guests can enjoy the natural hot spring water in a comfortable setting.
Additional facilities include a reclining bath and a germanium bath, allowing visitors to warm their bodies and relax at their own pace.
Food is another highlight of a stay at Yakushi Onsen Hatago. The inn’s signature irori kaiseki meals are served around a traditional Japanese sunken hearth, allowing guests to enjoy their food in an atmosphere reminiscent of an old mountain household.
The cuisine makes generous use of seasonal local ingredients, including Jōshū beef, locally grown vegetables, and river fish. Dining around an irori naturally encourages conversation and provides a memorable way to experience the food culture of Gunma.
The grounds of Kayabuki-no-Sato offer much more than hot springs. At places such as Makuragi Kaidō and Makuragi Square, visitors can try traditional Japanese games including kendama and ring toss.
There are also unusual attractions such as the Shōfuku Nanaren Bell, a set of seven bells said to bring good fortune when struck, and a huge iron cauldron reputed to be the largest of its kind in Japan.
After dark, the Star Viewing Terrace provides an opportunity to look up at the stars. With little artificial light in the surrounding mountains, the clear night sky can be particularly beautiful.
Yakushi Onsen Hatago welcomes not only overnight guests but also day visitors. In addition to bathing, visitors can explore the historic village grounds and view the cultural exhibits, making the site an appealing stop during a sightseeing trip.
The combination of hot springs, historic architecture, cultural displays, and natural scenery allows visitors to experience several aspects of traditional Japan in one place.
From the Shibukawa-Ikaho Interchange on the Kan-Etsu Expressway, the journey takes approximately 60 minutes via National Routes 17 and 353.
From JR Nakanojō Station, the journey takes approximately 40 minutes by car or shuttle bus.
Yakushi Onsen offers much more than a relaxing soak. It brings together hot springs, traditional architecture, local cuisine, cultural heritage, and mountain scenery in one distinctive destination.
The sight of historic thatched-roof houses gathered together in a peaceful mountain valley creates a nostalgic atmosphere and offers visitors a chance to experience a different side of Japan.
Soaking in a natural hot spring, enjoying a meal around an irori hearth, and exploring historic household objects and traditional buildings create an unhurried experience far removed from everyday life.
For travelers who want to experience the atmosphere of old Japan while enjoying the tranquility of a mountain hot spring, Yakushi Onsen Hatago is a memorable destination in Gunma.