Tsurumaki Onsen Kobo no Satoyu — Station-Side Hot Spring Near Tanzawa
A municipal day-trip hot spring just 2 minutes from Tsurumaki-Onsen Station on the Odakyu Line. Known for Japan's highest calcium content, it is the go-to post-hike bath for Tanzawa and Oyama hikers.
Tsurumaki-Onsen Station
2-minute walk from Odakyu Line Tsurumaki-Onsen Station
10:00–21:00 (last entry 20:30)
2 hours ¥800 (full day ¥1,000)
Mondays (following day if Monday is a holiday)
Walk-in OK
Overview
Kobo no Satoyu is a municipal day-trip hot spring in Hadano City, Kanagawa Prefecture, located just a 2-minute walk from Tsurumaki-Onsen Station on the Odakyu Line. Tsurumaki Onsen has been known as a healing spring for centuries, boasting one of the highest calcium contents of any hot spring in Japan.
Its convenient location near Tanzawa and Oyama trailhead access stations makes it a favorite post-hike stop for many hikers. The affordable pricing is another attractive feature.
Facility Information
Baths
- Indoor bath: Main bathing pool (separate for men and women)
- Outdoor bath: Rock bath
- Spring quality: Calcium-sodium chloride spring
- Benefits: Relief from nerve pain, muscle aches, joint pain, and fatigue
Pricing
| Category | 2 Hours | Full Day |
|---|---|---|
| Adult (junior high and above) | ¥800 | ¥1,000 |
| Child (elementary school) | ¥400 | ¥500 |
*Discounts available for Hadano City residents
Rest Facilities
A spacious tatami-mat rest area is available for relaxing after your bath. A light meal corner offers simple meals.
Access
From the ticket gates of Tsurumaki-Onsen Station on the Odakyu Line, head toward the south exit. The facility is about a 2-minute walk with clear signage.
- Train: About 70 minutes from Shinjuku Station on the Odakyu Line → get off at Tsurumaki-Onsen Station
- Car: About 15 minutes from Hadano-Nakai IC on the Tomei Expressway (parking available)
Tip: After descending the Okura Ridge from Tanzawa, you can reach here from Shibusawa Station in just one stop (about 3 minutes) on the Odakyu Line. A perfect ending to your hike.
Highlights
Two Minutes from the Station
When your legs are tired from hiking, the last thing you want is a long walk to a bath. The ultra-short distance from the station is a huge advantage.
Affordable Municipal Hot Spring
At ¥800 for 2 hours, it is very reasonably priced compared to private day-trip hot springs in the area. Plenty of time for a quick post-hike soak.
Calcium-Rich Spring Water
Tsurumaki Onsen’s calcium content is among the highest in Japan. The mineral-rich water is said to be especially beneficial for tired muscles and joints — ideal for hikers.
Nearby Trails
- Mt. Tanzawa (1,567m): Popular via the Okura Ridge (Baka-One). Accessible from Shibusawa Station, one stop away
- Mt. Oyama (1,252m): A sacred mountain accessible by bus from Isehara Station. Cable car available for beginners
- Tanzawa Main Ridge Traverse: The iconic traverse connecting Tonotake, Tanzawasan, and Hirugatake