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Kotobuki Onsen

寿温泉ことぶきおんせん

Public Bathhouse
Kyushu & Okinawa·Oita

Day Use

Yes
13:00–00:00
¥300

Bathing & Water

Natural onsen water

Uses natural hot spring water

Indoor BathYes

Enclosed indoor bathing area

Policies & Services

TattooYes

Allows entry with visible tattoos

WashingNo

Shower, wash stations, soap and shampoo provided

TowelsNo

Towels available to rent or borrow

ParkingNo

On-site or nearby parking available

None

寿温泉

Kotobuki Onsen
Bicarbonate
+ Chloride
Color
colorless and clear
Taste
tasteless
Odor
odorless

Sodium-Magnesium-Calcium Bicarbonate-Chloride spring

pH 7.7Weakly alkalineHot source · 54°CHigh silica
Composition fingerprint1.0 g/kg dissolved · Hypotonic
Na⁺42
Mg²⁺26
Ca²⁺26
HCO₃⁻61
Cl⁻24
SO₄²⁻15
CationsAnions
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Bicarbonate HCO₃⁻
"soda" — softens skin, leaves it smooth.
Known good for
  • Smooth skindry, rough skin
  • Aches & jointsstiff shoulders
  • Warmingcold sensitivity

A sodium-magnesium-calcium bicarbonate-chloride spring, filed on the certificate under its older classification as a soda-water (jūsō-sen) type with an earthy-chloride character. Weakly alkaline and soft on the skin, it sits in Japan's beauty-water family, with a salty edge from the chloride side and moderate mineralization at 1,015 mg/kg. The standout figure is metasilicic acid at 259 mg/kg — enough silica to leave the thin, moisturizing film that makes skin feel noticeably smoother afterwards. The water itself is colorless, clear, tasteless and odorless.

Sampled at delivery pipe·Analyzed Nov 12, 2019·公益社団法人大分県薬剤師会·Cert no. 大薬検 第7R-19110015号

Explore the water

Programs

About

A hot spring inherited since the Meiji era, known as the 'child treasure bath.' Located close to the downtown area, it is marked by the tropical plant 'basho' (similar to a banana tree). Records show renovations were done in 1899 (Meiji 32), but it became 'Kotobuki Onsen' in the Taisho era. Until then, it was said to be effective for women's diseases and had only a women's bath. Even now, the women's bath is overwhelmingly larger, with a bathtub twice the size and a changing room about three times the area of the men's bath. Unusually for a public bath, there is a lobby-like space inside the building, filled with retro items such as an old mirror and a scale. Bath tickets are purchased from a capsule machine for 500 yen for two tickets. It can be more economical to buy tickets when using with multiple people. The bathtub is located about three steps down from the changing room, with a high ceiling and excellent openness. The beautiful mint green walls and retro arched windows delight visitors, making for an enjoyable bathing experience. Fans come from afar, saying 'after bathing, you sleep soundly and do not catch a chill.' It is open until late at night.

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1 review

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Sergey M
4 months ago· edited

143. Kotobuki Onsen, Beppu A grandpa-style onsen for ¥300. Official hours are 13:00 to 00:00. They stamp the Beppu Onsendō rally book. No staff, no shower. The second and third visits weren’t as smooth as the first: - In December 2025, the humidity inside was extreme, moisture was even running down the locker walls in the changing room, it was stuffy and there was a bad smell. - In April 2026, there was no humidity problem, the air inside was fine, but a nail was sticking out of the wooden step in the bath. The water is clear, temperature is 44-45°C. 02.05.2024 27.12.2025 03.04.2026

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Last updated July 30, 2026