Kakogawa Onsen is a hot spring destination in Kamisō-cho, Kakogawa City, Hyogo Prefecture. It is known for Mitoro-so, a traditional hot spring inn featuring the only outdoor baths at a hot spring inn within Kakogawa City. Located on a gentle hill near the lower reaches of the Kakogawa River, the area is surrounded by peaceful countryside, offering a relaxing escape from the bustle of urban life.
The spring water is classified as a cold mineral spring containing carbon dioxide, calcium, sodium chloride, and bicarbonate. The source temperature is 19.4°C, with a flow rate of 37.6 liters per minute. The water is not suitable for drinking.
The spring has traditionally been associated with relief from conditions such as rheumatism, neuralgia, gout, chronic skin inflammation, lower back pain, sensitivity to cold, and arteriosclerosis. These are reported traditional indications rather than guaranteed medical benefits, and individual experiences may vary.
One of the main attractions at Mitoro-so is its pair of open-air baths. One is designed as a cave bath, while the other is an open-air bath with views over the surrounding landscape. The baths alternate between men’s and women’s use each day, allowing guests to experience both settings.
From the baths, visitors can look across the Harima Plain through a stand of bamboo. The scenery is particularly beautiful around the autumn full moon, when the moonlight enhances the peaceful atmosphere. A kamaburo bath, featuring an ultra-fine mist sauna, has also been added to the facilities.
The inn includes a large communal hall and a dining area. Meals feature fresh seafood delivered directly from Awaji Island each morning. Guests can stay overnight or visit for a day trip to enjoy the hot springs without booking accommodation.
Before Mitoro-so was built, local residents collected spring water from the area and heated it at home for bathing. The hill where the inn stands is also the former site of the main enclosure of Iguchi Castle, which dates back to the Muromachi period (1336–1573).
Mit oro-so first opened in 1965 as a public lodging facility. In 1986, it came under private management. Its president, Yasuhei Onishi, wanted to create a hot spring where he himself would enjoy bathing. After visiting hot spring destinations around Japan, he worked with the inn’s employees to build the outdoor baths by hand.
Blue stones from Shodoshima Island were used in the original outdoor bath, and a cave bath was added later. The facilities reflect the owner’s personal vision of creating a distinctive place to relax and enjoy the natural surroundings.
A tragic local legend is said to lie behind the name Mitoro-so. According to the story, in around the 15th century, a young man fell in love with Mitoro Hime, the daughter of Iguchi Ieharu, the lord of Iguchi Castle. Unable to win her affection, he killed her and buried her in the hills behind the castle.
The local people mourned her death and erected a stone Buddhist statue in her memory. The statue still stands with its head and gaze tilted slightly downward. Local legend explains this posture by saying that the princess preserved her virtue until the moment she fell. Over time, the name “Mitoro” is said to have evolved into the present place name, “Mitoro,” written with the characters 見土呂.
Near the hot spring area, Mitoro Fruit Park offers seasonal fruit-picking experiences. It is a popular destination for families and couples who want to enjoy fresh fruit and spend time outdoors.
Surrounded by nature, Heisō Lake is a pleasant place for fishing, picnicking, and lakeside walks. The changing scenery throughout the seasons makes it an inviting destination for visitors who enjoy the outdoors.
The wider area is home to several notable Buddhist temples, including Kakurin-ji, Jōdo-ji, and Ichijō-ji. These historic sites offer opportunities to discover the region’s religious heritage and traditional architecture while exploring the countryside around Kakogawa.
From JR Kakogawa Station on the Sanyo Main Line, transfer to the JR Kakogawa Line and travel to either Kanno Station or Yakujin Station. From Yakujin Station, the walk to the hot spring area takes approximately 20 minutes. A complimentary shuttle bus is also available, with one departure per day.
By car, the journey takes approximately 15 minutes from Kakogawa Interchange on the Kakogawa Bypass or from Miki-Ono Interchange on the Sanyo Expressway. From the northbound prefectural Route 18, follow the Kakogawa River, cross Kamisō Bridge, and continue to the nearby hot spring area. Access is also possible from Kakogawa-Kita Interchange on the Sanyo Expressway.
Kakogawa Onsen combines outdoor bathing, mist-sauna facilities, rural scenery, and a distinctive local history. Its panoramic baths, peaceful bamboo surroundings, and fresh seafood cuisine make it appealing for both overnight stays and day visits. For travelers exploring the Akashi and Kakogawa area, it offers a relaxing opportunity to unwind and experience a quieter side of Hyogo Prefecture.