Kakeyu Onsen is a historic hot spring resort located in Ueda City, Nagano Prefecture. Nestled along the clear waters of the Uchimura River, the resort is surrounded by mountains and forests, creating a peaceful atmosphere far from the bustle of major cities.
Kakeyu has long been known as a destination for toji, the traditional Japanese practice of staying at a hot spring resort for an extended period to rest and recuperate. The resort was officially designated as a National Hot Spring Health Resort in 1956, together with Reishoji Onsen and Oshio Onsen, reflecting its long-standing association with therapeutic bathing and health-oriented stays.
The name Kakeyu is connected with a beautiful local legend. According to tradition, Monju Bosatsu, the Buddhist bodhisattva associated with wisdom, appeared in the form of a deer and showed a devout hunter the location of the hot spring.
This story gave rise to the name Kakeyu, which can be understood as the “hot spring taught by a deer.” The legend remains an important part of the identity of the resort.
Nearby Monjudo Hall is dedicated to Monju Bosatsu and is said to house a statue of the bodhisattva carved by Gyoki, an influential Buddhist monk of ancient Japan. The statue is traditionally regarded as one of the Three Great Monju figures of Japan and continues to attract worshippers.
The hot spring water at Kakeyu Onsen is classified as a simple hot spring with mildly alkaline, low-osmotic, high-temperature water. The source temperature is approximately 42°C.
The water is clear and colorless, with little distinctive taste or smell. Its gentle character has made Kakeyu popular among people seeking a relaxing bathing experience and those staying for longer periods of recuperation.
Traditional descriptions of the spring’s benefits include relief from neuralgia, joint pain, sensitivity to cold, and fatigue. Kakeyu has also historically been valued for drinking the spring water, and it was once recognized as “East Ozeki” in a ranking of drinking hot springs. Traditional claims have included benefits for preventing stroke and managing high blood pressure, although hot spring water should not be considered a guaranteed medical treatment.
Kakeyu Onsen stretches along the Uchimura River, where the sound of flowing water and the surrounding greenery create a soothing setting.
Approximately 30 inns and larger hotels are located in and around the resort, offering a range of accommodation for visitors. Facilities such as medical and rehabilitation services and Kurhaus facilities have also supported Kakeyu’s tradition as a destination for longer stays focused on health and relaxation.
Visitors can experience the local bathing culture at the resort’s public baths. One of the best known is Monju-no-Yu, located near the historic Godaibashi Bridge, where one of Kakeyu’s oldest hot spring sources is traditionally said to have been located.
The facility has been renovated as a modern day-use hot spring bathhouse with an outdoor bath, while retaining its connection to the history of Kakeyu. It is enjoyed by both local residents and visitors.
For an even more casual experience, the Kakeyu Onsen Exchange Center in the center of the resort has a free foot bath. It is an ideal place to stop during a walk through the hot spring town and experience the warmth of the local waters without changing clothes.
Kakeyu Onsen developed as a toji destination because of the reputation of its waters. Historical records indicate that during the Edo period, even a local official from Nitta District in present-day Gunma Prefecture traveled here for a hot spring cure.
This suggests that Kakeyu was used not only by local residents but also by people from outside the immediate area. Over the centuries, the combination of hot spring bathing and Buddhist faith helped establish the resort as a place where visitors could seek both physical rest and spiritual peace.
On June 15, 1956, Kakeyu Onsen, Reishoji Onsen, and Oshio Onsen were designated together as the Uchimura Hot Spring Resort under a notification issued by Japan’s Ministry of Health and Welfare.
The collective name was later changed to Maruko Hot Spring Resort, which remains the broader name for this group of hot spring areas. Kakeyu continues to be associated with the tradition of health-oriented hot spring stays in Nagano.
From Ueda Station, served by the Hokuriku Shinkansen and Shinano Railway, take a Chikuma Bus service on the Kakeyu Line. The journey to Kakeyu Onsen takes approximately 45 minutes.
On weekends and public holidays, the Ueda-Matsumoto Line also provides access to the area. Get off at the Kakeyu Onsen bus stop.
From Matsumoto Station on the Shinonoi Line, Alpico Transportation buses on the Kakeyu Onsen Line take approximately 50 minutes to reach Kakeyu Onsen.
From the Nagano Expressway, Kakeyu Onsen is approximately 40 minutes from Matsumoto Interchange or Azumino Interchange. From the Azusagawa Smart Interchange, the drive takes approximately 30 minutes.
From the Joshin-Etsu Expressway, the resort is approximately 40 minutes from either the Tobu-Yunomaru Interchange or Ueda-Sugadaira Interchange.
The main access routes include National Route 254, also known as the Uchimura Kaido, and Nagano Prefectural Route 177, the Kakeyu-Bessho-Ueda Line. The surrounding mountain roads also make the journey part of the scenic experience.
Kakeyu Onsen offers a different kind of hot spring experience from large resort towns. Here, clear mountain streams, forests, historic Buddhist traditions, and a long-established culture of hot spring therapy come together in a tranquil setting.
The legend of the deer that revealed the spring, the Monju Bosatsu faith, the historic public baths, and the tradition of long-term toji stays all contribute to the unique character of the resort.
For travelers exploring Ueda and the surrounding mountains of Nagano, Kakeyu Onsen is a place to slow down, soak in gentle hot spring waters, walk beside the river, and experience a quieter side of traditional Japanese hot spring culture.