Mainichi Sauna Koshigaya Branch
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Mainichi Sauna Koshigaya Branch

Mainichi Sauna Koshigaya Branch is a sauna facility located in Koshigaya City, Saitama Prefecture. It is the third branch of the Mainichi Sauna Group, opened in May 2025, featuring a custom-made wood-burning sauna that can accommodate up to 35 people at once. Equipped with a steam generator on the wood stove, guests can enjoy a premium sweating experience during regular aufguss sessions while watching the flickering flames. The facility offers two types of cold plunge baths: a single cold plunge bath below 10°C and a beauty bubble cold plunge bath around 15°C, allowing guests to choose according to their condition and preference. With an indoor and outdoor relaxation space made from about 100 real birch trees, visitors can feel the warmth of nature while being in the city. A communication relaxation room is also available, where guests can enjoy connecting with others through the sauna experience.

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Address
3-3-1 Higashi Koshigaya, Koshigaya City, Saitama Prefecture
View on Google Maps
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Business Hours
Friday 12:00〜02:00
Monday 12:00〜02:00
Sunday 09:00〜02:00
Holiday 09:00〜02:00
Tuesday 12:00〜02:00
Saturday 09:00〜02:00
Thursday 12:00〜02:00
Wednesday 12:00〜02:00
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Closed Days
None
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Facility Type
Onsen & Spa
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Tattoo Policy
Tattoos Allowed
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Sauna & Cold Bath Information

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Custom Wood-Burning Sauna

90°C

A custom wood-burning sauna boasting the largest scale in the Mainichi Sauna Group. A spacious area that can seat up to 35 people simultaneously, equipped with a steam generator on the custom wood stove. The large stove window offers a view of the flickering flames, providing an extraordinary sense of relaxation. Regular aufguss sessions are held, where heat waves and steam draw out sweat all at once. The gentle heat unique to wood-burning saunas and the moderate humidity from the steam allow for a deep, core-warming experience.

Sauna Type
Dry Sauna
Stove Type
Convection Stove (Sauna Stone)
🪵 Wood-fired Sauna
Capacity
35people
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Single Cold Plunge Bath

9°C

A crisp, cold single plunge bath chilled to below 10°C. It quickly cools down the body temperature elevated by the wood-burning sauna, enveloping the entire body in refreshing coldness. The single coldness provides a profound sense of refreshment, achieving a powerful hot-cold alternating bath. It pairs excellently with the wood-burning sauna, offering a sharp finishing experience.

Water Quality
Tap Water
Capacity
5people
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Beauty Bubble Cold Plunge Bath

15°C

A beauty bubble cold plunge bath set at a slightly mild temperature of around 15°C. With the brand's first introduction of the beauty bubble system, micro bubbles envelop the entire body, promoting blood circulation, enhancing skin beauty, and aiding in fatigue recovery. Gentler coldness than the single plunge bath allows for a more leisurely soak. It can be alternated with the single cold plunge bath according to one's condition and preference.

Water Quality
Tap Water
Capacity
2people