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Gunma Kusatsu Town

Kusatsu Onsen Boun

A long-established inn founded in the Keicho era, where you can tour the two famous free-flowing baths of Nishinokawara and Bandai-ko

  • Kusatsu Onsen
  • Onsen Ryokan
  • Reserved onsen available
  • Natural Hot Spring
  • Free-flow from source
  • Sauna Available
  • Cold Bath Available

About Kusatsu Onsen Boun

Kusatsu Onsen Boun is a luxury, long-established hot spring ryokan with a history dating back to Keicho 3 (1598). It is located on a quiet hill about a 3-minute walk from Yubatake, the center of the hot spring town. It generously uses 100% free-flowing spring water from two celebrated Kusatsu springs: the famous Bandai-ko Spring, and the gentle Nishinokawara Spring, which only about six inns in Kusatsu draw. Guests can enjoy a lavish hot spring tour across three different large baths and open-air baths with distinct atmospheres. It also features a newly added stylish sauna and a single-person ceramic cold plunge bath, creating an exceptional pairing of famous hot springs and sauna.

Hot SpringONSEN

Free-flow from source

Large Bath Yuzan no Yu Bandai-ko Spring / Nishinokawara Spring

At the large bath Yuzan no Yu, the right-hand tub draws the gentle Nishinokawara Spring, while the left-hand tub draws the strongly acidic and powerful Bandai-ko Spring. This is an exceptionally luxurious bath where you can compare two of Kusatsu's signature springs at once. In the high-ceilinged, boldly timbered space, you can fully experience the differences in texture, cleansing effect, and warmth retention of each spring with your whole body.

Free-flow from source

Large Bath Bandai no Yu Bandai-ko Spring

The large bath Bandai no Yu lets you enjoy 100% free-flowing water from Bandai-ko Spring, the spring with the highest output in Kusatsu Onsen and a powerful source that naturally gushes at high temperature. Highly acidic, it is known for its extremely strong antibacterial and anti-inflammatory effects, warming the body from the core. After enjoying this famous spring in the indoor bath, you can indulge in a luxurious nature bath in the atmospheric open-air bath that blends into a beautifully maintained Japanese garden.

Free-flow from source

Large Bath Nishi no Yu Nishinokawara Spring

The large bath Nishi no Yu uses the extremely precious Nishinokawara Spring, which only about six inns in Kusatsu draw, with free-flowing spring water. Among Kusatsu's more stimulating waters, it is exceptionally gentle and characterized by a very soft feel on the skin. It has a spacious indoor bath and a half-open-air bath styled like a Japanese garden, with stone paving and trees, where the smooth, mellow water gently leaves your skin moist and cared for.

Free-flow from source

In-room Hot Spring Bath

A luxurious private free-flowing hot spring bath available in some of Boun's guest rooms. With in-room indoor hot spring baths in the new main building and open-air baths in Unshoan, guests can enjoy Kusatsu's famous waters whenever they like, in an exquisite space where no one will disturb them. It is a truly exceptional luxury to have all of Kusatsu's powerful, original hot spring energy to yourself during your stay, distinct from weakly alkaline waters.

SaunaSAUNA

01SAUNA

Large Bath Dry Sauna

Men'sWomen's

A stylish dry sauna newly installed in Bandai no Yu and Yuzan no Yu, with the warmth of wood throughout. The pleasantly dry heat gently warms the body from deep within and encourages abundant sweating. Sauna use is available until 23:00, allowing you to reset both body and mind in a calm space.

Cold BathCOLD BATH

01COLD BATH

Large Bath Cold Plunge Bath

Men'sWomen's

A ceramic single-person cold plunge bath. While it uses tap water, it stays refreshingly cold thanks to Kusatsu's crisp air, allowing you to cool down comfortably after getting heated. *During the winter season, around December to February, the cold plunge bath may be unavailable due to freezing and other conditions.

Facility Information

Address
377-1711 433 Kusatsu, Kusatsu-machi, Agatsuma-gun, Gunma Prefecture
Business Hours
14:00〜03:00/05:00〜10:00

[Day-use bathing] 14:00-18:00 (irregular holidays; service may be suspended depending on crowding, so advance phone confirmation is recommended). Adults 1,000 yen, children 700 yen.

Closed Days
Irregular Holidays
Gender Access
Gender Separated
Tattoo Policy (Communal Bath)
Unknown (Please Check)
Official Website
View official site

Access

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JAPAN ONSEN COLLECTION

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52

A curator who has visited over 300 facilities nationwide handpicks 52 exceptional ones they wholeheartedly recommend. The only guidebook that deeply explores the allure of onsen and sauna—plus culture and etiquette.

Read a free preview
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JAPAN ONSEN COLLECTION
JAPAN ONSEN COLLECTIONJapan's Finest Onsen & Sauna
A journey through 52 renowned hot springs and saunasJAPAN ONSEN & SAUNA GUIDE

Japan's Finest Onsen & Sauna

52 Extraordinary Destinations

A curator who has visited over 300 facilities nationwide handpicks 52 exceptional ones they wholeheartedly recommend. The only guidebook that deeply explores the allure of onsen and sauna—plus culture and etiquette.

300+Facilities
Visited
Read a free previewJAPAN ONSEN & SAUNA GUIDE