From the station, a 3-minute walk turns a train ride into a seaside soaking experience. Inamuragasaki Onsen faces Sagami Bay, where clear air allows distant views of Enoshima and Mount Fuji; the sea's hues at dusk and the island's lights after nightfall offer a completely different atmosphere.
A dark hot spring, also known as "Golden"
Travelers often refer to it as "black hot spring," but the inn describes it as a brownish golden hue. This is the Mōru spring, rich in organic plant matter, classified as a bicarbonate cold mineral spring; when viewed through the light, it appears amber, deepening to a darker shade at greater depths, creating a striking contrast with the sea surface outside the window. It is known locally as the "Golden Spring," with the key experience being the atmosphere created when the spring water meets the sea view.
For sea views, reserve a daytime slot
The main baths are “Fujimi no Yu” for men and “Oshima no Yu” for women. Arrive before dark if you want clear views of the coast and distant mountains, and visit Inamuragasaki Park across the road before or after bathing. Clouds, humidity and viewing angles affect Mount Fuji’s visibility; it cannot be guaranteed from every bath or on every visit.
Choose between the main baths and private family baths
The main baths are for ages 13 and above. Private family baths require a telephone reservation and at least 2 adults; children must be at least 4 years old and no longer use diapers. Room types include indoor baths and options with an open-air bath and sauna. When booking, confirm the room, views, charges and current restrictions to plan your group’s visit.
Before and after soaking in the onsen, stroll slowly through Inamuragasaki.
Start the afternoon at the park’s headland and the site associated with the Nitta Yoshisada legend, then bathe and finish with a meal at the seaside restaurant Ninai. If you want to watch sunset in the park, allow time to change and leave the baths. To continue along the coast to Shichirigahama, allow extra walking time and follow roads with pedestrian space.
- Location
- About a 3-minute walk from Inamuragasaki Station, beside Route 134 and across from the park.
- Hours
- 9:00–21:00; last admission 20:00. Maintenance closures are announced separately.
- Fees
- General admission ¥1,600; towel-set rental ¥520. Peak-season charges and private family baths are priced separately.
- Time to allow
- Allow 1–2 hours for bathing, or about half a day including the park and a meal.
Fees and conditions were checked on September 15, 2026. The bath photographs show the actual empty facility and were supplied by its operator. Follow the facility's photography rules during your visit.