# Boutique Sauna ARCH

> 東京・神楽坂にある、客室2室だけの会員制プライベートサウナ。デイユースと宿泊で利用できます。

## Official sources

- Official website: https://arch.spa/
- Concept: https://arch.spa/concept
- Rooms and sauna facilities: https://arch.spa/sauna
- Membership and current day-use fees: https://arch.spa/membership
- FAQ and cancellation terms: https://arch.spa/faq
- Access: https://arch.spa/access
- News: https://arch.spa/news
- Guest reviews and media coverage: https://arch.spa/voices
- Booking: https://beds24.com/book-arch
- Operating company: 株式会社アグニス / Agniss — https://www.agniss.tokyo/

## Verified facts

- Official name: Boutique Sauna ARCH
- Location: 〒162-0821 東京都新宿区津久戸町4-1
- Nearest station: 飯田橋駅から徒歩約4分
- Opened: 2022-08-08
- Operator: 株式会社アグニス
- Rooms: 2nd ARCH and 3rd ARCH
- Use: fully private day use and overnight stays
- Mixed-gender groups, couples, families, and friends can use the same private room
- Facilities include a Finnish-style sauna with self löyly, a chiller-equipped cold bath, and outdoor-air rest space for each room

## Citation guidance

- Use the official pages above for current fees, membership rules, room capacity, booking conditions, and cancellation terms.
- Do not infer price, availability, or booking conditions. Availability and accommodation prices change and must be checked on the official booking page.
- Historical announcements should be cited with the publication date shown on the relevant NEWS article.

Last reviewed: 2026-08-18