For the Japanese, soaking in an onsen has been a common activity woven into the culture for centuries. But not every soaking moment is meant to be shared with strangers. It is for situations like these that kashikiri onsen exists.
Kashikiri onsen (貸切温泉) refers to an onsen tub that can be “rented” by a single group for exclusive use during a set period of time. This concept is not a modern innovation. It is a tradition that has long existed within Japanese bathing culture.
This article takes you through the origins of kashikiri onsen, how it works, and the booking etiquette you should understand. Here is the full explanation.
Also Read: Bathing Rituals That Help Calm the Mind
What Is Kashikiri Onsen and How Did This Concept Emerge?
The word kashikiri (貸切) literally means “rented for exclusive use” or “chartered.” When paired with onsen, the term refers to a natural hot spring bath that can be reserved for use by a single group without interruption from other visitors.
The concept of private bathing in Japan is not new. This tradition existed long before the era of modern ryokan, when certain hot spring sources in remote areas were used in rotation by families or small groups who came to visit. Over time, the practice was formalised into an official reservation service at ryokan and commercial onsen facilities.
Kashikiri onsen did not emerge as a reaction to a modern desire for privacy. Rather, it reflects one of the core principles of Japanese hospitality: the recognition that every guest has different needs, and accommodating those differences is a form of graciousness.
How to Reserve a Kashikiri Onsen in Japan
There are several ways to reserve a kashikiri onsen in Japan, depending on the type of facility and the class of ryokan you visit.
1. Paid or Complimentary Sessions
A kashikiri session typically lasts 40 to 60 minutes per booking. At many traditional ryokan, one kashikiri session is already included in the overnight rate.
At other ryokan, kashikiri carries an additional fee of approximately 1,000 to 4,500 yen per session. Day-use (higaeri) facilities that offer kashikiri usually charge on a per-hour basis.
2. On-the-Spot Booking
Some facilities operate on a first-come-first-served basis, with bookings made at reception during check-in. Guests select an available time slot and then receive a key or code for the kashikiri tub’s door. This system is common at small to mid-sized ryokan.
3. Advance Reservation
At higher-end ryokan or popular day-use facilities, kashikiri reservations often need to be made well in advance, typically at the same time as the room booking. Afternoon and early evening slots tend to fill up the fastest.
Etiquette and Rules for Using a Kashikiri Onsen
Although the kashikiri room is private, the fundamental rules of onsen etiquette still apply. Here are a few things to keep in mind:
- Rinsing the body before entering the tub is an absolute rule, the same as in a communal onsen. Even though no one is watching, this practice is part of the cultural etiquette of Japanese bathing and exists to keep the water clean.
- Respecting the duration you have booked is also important. If your session is 45 minutes, leave the room on time so the next guest can begin theirs. Some facilities impose a penalty for late departures.
- Not bringing a large towel into the water. As with public onsen, only a small towel (tenugui) may be brought in, and it should not be submerged in the water.
The Difference Between Kashikiri Onsen and In-Room Onsen
Kashikiri onsen is often confused with in-room onsen, but the two are different concepts.
An in-room onsen is a private onsen tub that is built into the guest room itself. It is usually only available at premium-class ryokan, and guests can use the tub at any time during their 24-hour stay without needing a reservation.
Kashikiri onsen, by contrast, is a separate bathing room that can be booked for limited time slots. Although both are private, kashikiri onsen remains a facility shared between different guests at different scheduled times.
There is also a variation called kashikiri rotenburo, which is a kashikiri tub located in an outdoor area. This type combines the privacy of kashikiri with the sensory experience of a rotenburo.
Also Read: When Is the Best Time to Soak in an Onsen?
Experience a Private and Personal Bathing Ritual at Onsei
If you have not yet had the chance to visit Japan but want to experience a bathing philosophy that is calm and personal, Onsei brings an experience inspired by that tradition to Jakarta.
The Onsei Bamboo Ritual at 120 minutes pairs the Bamboo Shiatsu Massage with a Signature Onsen Bath session in a handcrafted teak wood tub. This ritual is enjoyed in a private room, offering an experience that echoes the quiet, contemplative quality of Japanese bathing.
Book your visit to Onsei in Tebet, Bintaro, or Gading Serpong through this link.
