Onsen OniOnsen Oni

Oyado Noshiyu

お宿 のし湯おやど のしゆ

Stay FacilityOperational
KumamotoKurokawa Onsen黒川温泉
0967-44-0308noshiyu.jp

Day Use

15:00 – 18:00
Hours notes

There are occasional holidays

Bathing & Water

Outdoor Bath

Open-air outdoor bath

Indoor Bath

Enclosed indoor bathing area

Onsen

Uses natural hot spring water

Capabilities

Private Bath

Private bath available for day-use visitors or hotel guests to reserve

Room Onsen

Private onsen bath in guest rooms, for overnight guests only

黒川温泉(のし湯)

Kurokawa Onsen (Noshiyu)

Operated by · お宿 のし湯

曹
Bicarbonate
+ Sulfate · Chloride
Classification

Sodium Bicarbonate-Sulfate-Chloride spring

A hot 75.8 °C sodium-bicarbonate spring with sulfate and chloride layered in, sitting at neutral pH 6.7 — well above 65 °C, among Japan's hotter natural sources. A faint hydrogen sulfide note hangs over the bath. With 303.8 mg/kg of metasilicic acid, the water leaves a thin silica film that makes skin feel noticeably smoother afterwards.

Source temperature
75.8°C
Hot
Tonicity
1.96g/kg
Hypotonic
Free CO₂
130mg/kg
Low
Free H₂S
0.50mg/kg
Low
Radon
0.37Bq/kg
Low
Color
nearly colorless and clear
Taste
tasteless
Odor
faint hydrogen sulfide
Highlights
  • High silica
  • Top-decile hot

Analyzed Sep 16, 2022·株式会社九州テクノス·Cert no. 熊本県阿蘇保健所登録第3号

Programs

4.0

1 review

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Sergey M
5 months ago· edited

13. Oyado Noshiyu, Kurokawa Onsen ★★ I visited for a day trip; it's located near the Kurokawa tourist center. The area consists of separate cottages, with a very natural and old-fashioned vibe. Usually, day trips are available from 3:00 PM to 6:00 PM, with some weekend days during the week. It is part of the Kurokawa tag. For day trip visitors, only one large outdoor bath is accessible. Guests staying at partner inns Fujiya and inn-NOSHIYU also have free access to the outdoor bath at Oyado Noshiyu from 3:00 PM to 9:30 PM and from 7:00 AM to 10:00 AM. Those staying directly at Oyado Noshiyu have access to an additional public indoor bath and five different private baths. The large outdoor bath is made of stone. There is a fence, but everything is surrounded by trees, creating a very natural and pleasant atmosphere both during the day and in the evening. The water is clear, with varying temperatures: it was 40°C on one visit and 43°C on another. Additionally, in a secluded corner of the bath, the temperature was one degree higher. The bath is shallower under the roof. A great large rotenburo (outdoor bath) and a convenient location; recommended for visiting. 27.12.2023 08.04.2025 28.12.2025