Right Onsen › Gunma › Ueno
Hamadaira Onsen Shioji no Yu
4.0★ · 543 Google ratings · Ueno, Gunma · 浜平温泉しおじの湯
✓ Natural hot-spring water✓ Outdoor bath✓ Rest area✓ Restaurant
Before you go
Can you bathe here?
Day visitors
✓ Yesstated on the facility's website · read 2026-09
Hours
11:00–20:00 · closed Thursday, Fridayfrom the facility listing
Price
¥600Adult admission is a consistent 600 yen, with a senior discount to 500 yen.stated by 6 visitors · Apr 2026 – Aug 2026
Tattoos
Not known · call aheadno policy stated in the 33 recent reviews we read or on the facility's website
The bath
What you’ll find
A remote, riverside village-run onsen in Ueno-mura with a small indoor bath and a highly praised outdoor bath overlooking the Kannagawa river; the 14.7C weakly acidic cold mineral source is heated and chlorinated (no sauna or cold plunge), and one reviewer drove two hours only to find it closed for unannounced maintenance.
Outdoor bath
✓ YesAn outdoor bath overlooking the Kannagawa river is the facility's main draw.stated by 8 visitors · Sep 2025 – Aug 2026
Indoor baths
1There is one indoor bath.stated by 1 visitor · Jun 2026
Sauna
NoThere is no sauna.stated by 1 visitor · May 2026
Cold bath
NoThere is no cold plunge bath.stated by 1 visitor · May 2026
View
RiverThe outdoor bath directly overlooks the Kannagawa river.stated by 6 visitors · May 2026 – Jul 2026
Rest area
✓ YesA modest rest area with sofa-style seating and a sunroom terrace is available.stated by 2 visitors · Oct 2025 – Jun 2026
Restaurant
✓ YesA well-liked restaurant serves local specialties like inobuta (wild boar-pig) pork dishes, though its hours are short.stated by 8 visitors · Sep 2025 – Aug 2026
The water
Spring type
Sodium sulfate, high metasilicic acid, weakly acidic cold mineral springThe spring is a hypotonic, weakly acidic cold mineral spring, sodium-sulfate leaning, notable for high metasilicic acid content said to give skin-smoothing effects.stated by 4 visitors · May 2026 – Aug 2026
Source temperature
14.7°CThe posted spring analysis (Reiwa 3) lists a source temperature of 14.7C.stated by 1 visitor · Jun 2026
pH
pH 3.6The official posted spring analysis states pH 3.6, though one other reviewer separately recalls being told pH 4.2.stated by 1 visitor · Jun 2026
Heated
✓ YesThe naturally cold (14.7C) source is heated to a bathable ~40C.stated by 3 visitors · May 2026 – Jul 2026
Chlorinated
✓ YesSeveral reviewers detect a mild chlorine/disinfectant smell.stated by 3 visitors · Nov 2025 – Jul 2026
Practical
What to bring
Soap & shampoo
✓ ProvidedBody soap and shampoo/conditioner are provided.stated by 3 visitors · May 2026 – Jun 2026
Lockers
✓ FreeChanging-room lockers require no coin.stated by 2 visitors · Nov 2025 – Jun 2026
Hair dryer
✓ FreeTwo hair dryers are provided with no fee mentioned by reviewers.stated by 2 visitors · May 2026 – Jun 2026
Guide
What visitors add
Price
Adult admission is 600 yen (6 distinct reviewers, Sep 2025 - Aug 2026); one reviewer adds seniors 70+ pay 500 yen, and another paid only 300 yen using a discount coupon obtained at Mahoba no Mori.
stated by 6 visitors · Sep 2025 – Aug 2026The water
The water is a weakly acidic, hypotonic cold mineral spring: one reviewer transcribes the posted 2021 analysis (source name 'Yunosawa no Yu', 14.7C source temperature, pH 3.6, 107.7 mg meta-silicic acid out of 512 mg dissolved solids, drinkable), and a second reviewer independently cites the same classification; a third was told pH 4.2. High meta-silicic acid / 'bijin-no-yu' (beautifying) claims are echoed by 3 reviewers, and the water's astringent 'kishimi' feel is described by 2.
stated by 6 visitors · Oct 2025 – Aug 2026Outdoor bath & sauna
There is one indoor bath and one open-air bath; the rotenburo directly overlooks the Kanna river rapids and is the facility's highlight (at least 6 distinct reviewers praise bathing to the sound of the stream). One reviewer notes the men's rotenburo is partially visible from where anglers fish on the river.
stated by 6 visitors · May 2026 – Jul 2026Water handling
Because the source is cold (~15C), the bath water is heated: 3 distinct reviewers state the water is heated (kaon), with bath temperature around 40-41C; 3 distinct reviewers also note a mild chlorine/disinfectant smell. No review claims kakenagashi.
stated by 5 visitors · Nov 2025 – Jul 2026Towels, soap & lockers
Body soap and rinse-in shampoo are provided (3 distinct reviewers) along with 2 dryers; lockers are free (no coin) but for valuables only, with clothes going in open baskets (2 reviewers), and there are open shoe shelves rather than lockable shoe boxes. Wash stations number about 8 plus a shower booth (2 reviewers; one counts 4+4 mixer taps plus 1 booth).
stated by 5 visitors · Nov 2025 – Jun 2026Day-use visits
One detailed reviewer (June 2026) gives hours as normally 11:00-19:00 (until 20:00 Saturdays), 11:00-18:00 in winter, with last entry 30 minutes before close; an 11:00 opening is corroborated by a reviewer who queued at opening on Aug 14. One reviewer drove 2 hours only to find an unannounced maintenance closure (Nov 2025), so checking ahead is wise.
stated by 3 visitors · Nov 2025 – Aug 2026Timing
When to go
| Day | Hours |
|---|---|
| Monday | 11:00–20:00 |
| Tuesday | 09:00–20:00 |
| Wednesday | 11:00–19:00 |
| Thursday | Closed |
| Friday | Closed |
| Saturday | 11:00–20:00 |
| Sunday | 11:00–20:00 |
Closed Thursday, Friday.
Practical
Plan your visit
📍 3487-2 Narahara, Ueno, Tano District, Gunma 370-1617
🚃 Shimonita station, 17.2 km
📞 +81274-59-3955
📋 Show at the counter: 浜平温泉しおじの湯
Nearby
Other baths close by
Shimonita · 4.2★
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