Tokura Onsen, Chikuma, Nagano Prefecture
Manyo Ultrasonic Onsen
The earliest opener in the area, at 04:00, making it a strong choice for an early bath or rail itinerary. Zuisho has more facilities and stays open later.
Check before bathing
- Opening hours
- 04:00–23:00; last admission 22:30. Closed one Tuesday each month; check the current schedule, especially around public holidays.
- Access
- About 5 minutes by car or 15 minutes on foot from Tokura Station. Parking for 70 cars. A JNR Series 115 train is displayed on the grounds.
- Tattoo policy
- The facility's current first-party information does not confirm a tattoo policy. Check with the bathhouse before visiting.
Spring & water temperature
- Spring-source temperature
- Not published. The spring is classified as hot, but older pool temperatures are not used as its source temperature.
- Bathing temperature
- Not published as a current fixed value. Pool temperatures reported during a 2024 tourism event are not treated as current settings.
- Spring source
- A natural spring that rises on the facility grounds; the current page does not give an individual spring name.
- Spring classification
- Simple sulfur spring; mildly alkaline, low-salinity and hot.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The current official page presents the bath as genuine, source-flowing natural hot-spring water. It does not publish water addition, heating, circulation or disinfection conditions for each pool, so no further treatment details are inferred.
Bathing indications
The tourism bureau lists general bathing indications including sensitivity to cold, muscle or joint discomfort, neuralgia, cuts and fatigue. These are not treatment guarantees.
The facility highlights source-flowing natural water, but does not publish complete treatment conditions for each pool.
Admission is ¥480 for adults, ¥100 for elementary-school children and ¥50 for younger children; children under 3 enter free. The premises also display a retired Series 115 train.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
