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Japan’s onsen represent one of the world’s most refined bathing cultures. For more than a thousand years, people have shaped not only the abundant waters that spring from this volcanic archipelago, but also the very experience of soaking in them. The depth of history and custom accumulated here is hard to find anywhere else.
Behind each piece of bathing etiquette lies a clear reason—hygiene, safety, or culture—polished quietly over centuries. Learning these customs is not about making the onsen feel restrictive. It is more like receiving a map that lets you enjoy the waters more freely and more deeply.
In this guide, we’ll walk through the basic ways to enjoy an onsen, alongside the reasons behind the common questions everyone has wondered about at least once when bathing in Japan.
Let’s take a look at the map together—the customs that help you meet the waters, and the cultural background that gives them shape.
Let’s start by tracing the basic flow of bathing. We’ll follow the 12 points of "Bathing Etiquette" published by the Japan Spa Association, organized along the actual steps you’ll take.
Once you enter the changing room, remove all your clothing, including underwear. Bathing fully nude is the rule at Japan’s public onsen, and swimsuits are generally not permitted.
Place your clothes in one of the baskets or lockers provided in the changing area.
There are two kinds of towels you’ll use at an onsen: a large bath towel and a small face towel. At a ryokan they’re provided in your room; at day-trip facilities, you typically bring your own or rent them on site.
Of these, only the small face towel goes into the bathing area. The bath towel is for drying off after bathing, so leave it in the changing room.
An important step before entering the bath is kakeyu (pre-bath rinse). When cold skin suddenly meets very hot water, blood pressure can spike and cause dizziness or palpitations. Kakeyu helps your body adjust gently to the heat.
You’ll usually find a dedicated kakeyu spot near the entrance, or a bucket placed beside the bathtub.
Three to five scoops is a good guideline. Start at the ankles and work upward—knees, hips, shoulders—pouring water on the parts of your body farthest from the heart first.
If you’re scooping water from the bathtub itself, take care that the water splashing off your body doesn’t fall back into the bath. Lift the water out, step away from the tub, and pour quietly.
After kakeyu, you wash your body and hair at the washing area. This is one of the most important parts of onsen etiquette, because in Japan the bathtub is not a place to clean yourself, but a place to soak after you are already clean.
The washing area is equipped with a small stool and a bucket. Sitting on the stool while you wash is the norm—standing up and using the showerhead sends water splashing onto people around you. Aim the showerhead toward yourself, and be careful that it doesn’t spray the neighbor beside or behind you.
Shampoo and body soap are usually provided, but you’re welcome to bring your own. Lather your body with your hands or a body cloth you’ve brought, and rinse thoroughly so that no suds remain on your hair, face, or skin.
It’s best to avoid using body soap on the small face towel you brought into the bathing area. That towel is meant for wiping yourself down just before returning to the changing room.
Once you’ve finished washing, tie up any hair that falls below the shoulders with a hair tie or your towel. This too is a small piece of etiquette that helps keep the bath clean.
The bathtub is a place to slowly warm your body and let your mind unwind. Watch the steam rise, take in the scenery, listen to the quiet—this is where the onsen experience truly begins.
Remember, the bath is shared with other guests. Swimming, diving under, jumping in, talking loudly—these are all things to avoid.
And one rule worth highlighting: never put your towel into the water. Detergent or dirt from the towel will cloud the bath, so fold the small towel and place it on top of your head, or set it on the edge of the tub.
Water temperatures vary from one onsen to another. Some are lukewarm and meant for long, relaxed soaks; others are hot and warm you to the core in a short time. Pay attention to the heat and to how your body feels, and adjust your time in the bath so you don’t overheat or develop Yuatari (onsen overheating / bath fatigue).
When you leave the bath, gently wipe off the water on your body with your face towel before stepping back into the changing room. This keeps the changing room floor dry, and prevents you or anyone else from slipping and falling.
Many onsen ryokan and day-trip facilities have a rest area called the Yuagari-dokoro (post-bath lounge). A bottle of coffee milk or fruit milk, drunk with one hand on your hip while your flushed body cools down, is as much a part of the onsen journey as the soak itself.
Japan’s Ministry of the Environment suggests bathing for 3 to 10 minutes if you’re new to onsen or not used to them, and up to 15 to 20 minutes even if you’re experienced. Going beyond these times can bring on dizziness, lightheadedness, or a flushed feeling. If you bathe many times across consecutive nights, you may also develop Yuatari (onsen overheating)—a sluggish, headachy feeling that appears a few days later.
Why is it the rule to bathe fully nude in Japan’s onsen? Many visitors wonder if a swimsuit wouldn’t be simpler. There are actually two reasons behind this custom: one rooted in hygiene, and one in culture.
The hygienic reason is straightforward and practical. The fibers of swimsuits and underwear carry traces of dirt and detergent from the outside world. To protect the purity of the source water, those things are not brought into a shared bath. It’s a quiet agreement the Japanese have kept for a long time.
The cultural reason runs deeper. Japanese bathing has long been tied to Misogi, a Shinto ritual purification by water performed to wash away spiritual and physical impurities before approaching the sacred. Stepping into the water still clothed strays from that original meaning.
There’s also the well-known phrase hadaka no tsukiai, literally “naked communion.” The concept refers to the idea that bathing nude together strips away social hierarchies—age, status, profession—and creates an equal, honest connection. The nudity here is not erotic but symbolic of openness and equality. When you lower yourself into the bath, titles, ages, and the differences in how you dress all dissolve in the water, and everyone shares the bath as a single, equal human being.
There is also a gentle, unspoken rule about where you look: don’t stare at other bathers’ bodies. Put the other way, no one is staring at you either. This quiet courtesy is part of what lets everyone relax in the bath without worrying about each other.
A handful of facilities do allow swimwear. These include Kurhaus—complex bathing facilities with warm pools and tubs—and certain wild hot springs (natural undeveloped springs) along the coast. But these are exceptions where “swimsuits OK” is clearly stated; at a regular onsen, fully nude bathing remains the standard.
If you have surgical scars, tattoos, or simply feel hesitant about being naked in public, some onsen allow you to wear a Yuamigi (bathing garment)—a thin piece of clothing made specifically for bathing. Private baths and in-room outdoor baths, described later, are also good options. Yuamigi is being accepted at a growing number of facilities, not only mixed-gender baths but also gender-separated ones.
“Can I enter a Japanese onsen if I have a tattoo?”
For international visitors in particular, this is probably one of the biggest questions.
Today, many onsen facilities still do not allow guests with tattoos. But that view is shifting, and the number of places that welcome bathers with tattoos is slowly growing.
So why have tattoos been an issue at onsen in the first place? The answer lies in Japan’s postwar history.
After its defeat in World War II, Japan was thrown into a period of upheaval marked by the collapse of state functions and rapid economic and social change. The police were weakened by GHQ (General Headquarters, Supreme Commander for the Allied Powers, the Allied occupation authority that governed postwar Japan), and even their use of weapons was restricted. They were unable to keep up with the worsening security of the postwar years.
It was in this gap that the Yakuza (Japanese organized crime syndicates) grew in influence.
Immediately after the war, Japan faced severe shortages and hyperinflation. The country’s official rationing system had completely broken down, and people had no choice but to rely on black markets to survive.
The groups that effectively built, ran, and policed these black markets were the tekiya (festival vendors) and gurentai (street gangs)—the same groups that would later evolve into the Yakuza. They collected “stall fees” from vendors and, in exchange, secured supply routes and settled disputes, functioning as a shadow police force and shadow administration.
With few forms of entertainment available in the postwar years, entertainment businesses—music shows, films, professional wrestling, sumo—became hugely popular, and the Yakuza were involved behind the scenes here too. They handled trouble on regional tours, provided personal security for stars, and arranged venues. In that era, “if you wanted to put on a show, you went through the local boss” was the unwritten rule, and the entertainment industry was fully intertwined with these groups.
As Japan rebuilt and entered its period of rapid economic growth, the Yakuza embedded themselves deeply in legitimate businesses. They were not simply a criminal organization, but became something closer to a necessary evil that filled the gaps left by a state in disrepair: maintaining order in place of the police, distributing goods in place of the government, and organizing labor in place of corporations. This gray coexistence with mainstream society continued for decades, until the Anti-Organized Crime Act of 1992 and the completion of the Anti-Organized Crime Exclusion Ordinances in 2011.
And the people in these Yakuza organizations were the ones who wore tattoos. For them, tattoos were a sign of loyalty and resolve toward the group, and a display of endurance and inner strength. They were done in wabori (traditional Japanese tattoo) style, using designs and techniques from Japan’s tattoo tradition, and were often inked in the mune-wari (chest-split style)—a style that leaves an unmarked strip down the chest so the tattoos can stay hidden under clothing.
To ordinary citizens, then and now, the Yakuza have always been a source of fear. Especially in the Showa era, when relatively few overseas travelers visited Japan, “tattoo equals Yakuza” was a fairly reliable assumption.
In other words, for Japanese people, tattoos were not seen as fashion but as the trademark of the Yakuza.
Against this historical background, tattoos came to be widely associated with intimidation. From around the time of Japan’s super sento boom in the late 1980s, “other guests will stay away” became the stated reason that no-tattoo rules took root at bathing facilities.
But the wind is shifting today.
In March 2016, the Japan Tourism Agency (JTA) issued a statement to onsen facilities across the country saying that refusing entry to a bather solely because they have a tattoo is not appropriate. The notice presented three practical approaches: asking the bather to cover the tattoo with a sticker, separating bathing times, or offering a private bath. It also included the realistic suggestion that small tattoos and others that do not appear intimidating to fellow bathers do not need special handling.
Ahead of the Tokyo 2020 Olympics and the 2025 Osaka-Kansai Expo, the movement to welcome people with tattoos—whether religious, cultural, or fashion-related—has accelerated further. Hoshino Resorts’ onsen ryokan brand "KAI" has handed out skin-tone tattoo cover stickers for free at all of its facilities since 2015, and is known as an example that helped shift industry thinking.
That covers the history of tattoos and onsen. Even so, rules still vary from one facility to another. Here are some practical options that let bathers with tattoos enjoy onsen with peace of mind.
| Approach | Details |
|---|---|
| Choose a tattoo - friendly facility | Onsen that explicitly state "tattoos welcome." Searchable via dedicated database sites. |
| Cover with a sticker | Thin skin - tone stickers (about 8 × 10 cm / 3 × 4 inches) that hide a tattoo. Available at Don Quijote, drugstores, and online stores. |
| Use a private bath or in - room outdoor bath | Reserve a shared bath for private use by the hour, or stay at an inn that has a private tub in the guest room. The most reliable option. |
When searching for tattoo-friendly onsen, specialized sites like Tattoo - Friendly are useful. More than 1,600 facilities are listed there, with map-based search available.
Beppu Onsen also publishes a tattoo-friendly map on its tourism portal “Enjoy Onsen Beppu,” featuring more than 100 facilities. (Tattoo - friendly Onsen! Beppu in Japan has 100 hot springs where tattoos are welcome - Enjoy Onsen)
“Sharing a bath with strangers still feels like a stretch.” “I’d like to enjoy the bath alone with my family or partner.” For moments like these, there’s the option of a private bath (kashikiri buro).
A private bath is a paid service that lets you have a bathing room to yourself for a set time (often 40 to 90 minutes). You lock the door and use it as a family or couple. Because the fee is set per room, splitting it among several people keeps the per-person cost reasonable.
The private bath is a reassuring option for many kinds of guests: those with tattoos, those who feel uncomfortable being naked in public, families with children, couples, and groups traveling together.
In Japan’s onsen, having separate bathing areas for men and women feels like the default. But this arrangement is actually not that old. Up through the Edo period (1603–1868), many onsen towns in rural Japan had konyoku (mixed-gender bathing), in which men and women shared the same bath.
The turning point came with the Meiji government’s modernization policies. In 1900 (Meiji 33), a Home Ministry ordinance prohibited mixed-gender bathing at public bathhouses across the country as a general rule. The intent was to present Japan as a “civilized nation” in the eyes of Western powers. From then on, gender-separated baths became the Japanese standard.
Even so, mixed-gender bathing culture has not disappeared entirely. At hidden hot springs in the mountains, parts of certain historic ryokan, and some local communal bathhouses, mixed baths still quietly remain.
| Onsen | Location | Highlights | Dress code |
|---|---|---|---|
| Sukayu Onsen Ryokan | Aomori | First - designated National Health Resort Hot Spring (1954). The all - hinoki cypress "Hiba Sennin - buro" (Hiba Thousand - Person Bath) is about 160 tatami mats (approx. 260 sq m / 2,800 sq ft). | Fully nude (yuamigi for sale; women - only hours in the morning and evening). |
| Nyuto Onsen, Tsurunoyu Onsen | Akita | Thatched - roof inn and a milky - white mixed - gender outdoor bath. Nationally known as a leading example of mixed bathing. | Fully nude (women - only hours at night). |
| Takaragawa Onsen, Osenkaku | Gunma | A large outdoor bath spreading along a mountain stream, about 470 tatami mats (approx. 760 sq m / 8,200 sq ft). Switched to a yuamigi - required style in 2019 to welcome a wider range of travelers. | Yuamigi required (for both men and women). |
| Hoshi Onsen, Chojukan | Gunma | Founded in 1875 (Meiji 8). The main building is a Registered Tangible Cultural Property, and the Meiji - era "Hoshi - no - yu" features water rising naturally from the bottom of the bath. | Fully nude (women - only hours available). |
Mixed-gender baths are declining, but they have not vanished. They remain as one of the options for those who want to experience them.
It’s natural to want to capture onsen memories in photos. But inside the bathing area and the changing room just before it, no smartphones, no cameras—that is an absolute rule at Japan’s onsen.
The reason is clear: protecting the privacy of other bathers. Many onsen facilities and public bathhouse associations explicitly state in their official guidance that “the use of smartphones and any photography is prohibited in the changing room and bathing area.”
And today, this is no longer just a matter of etiquette. Under the Photographing Offenses Act (commonly called “the photography crime law”), which took effect on July 13, 2023, taking pictures without consent in places where people are naturally undressed—such as bathing areas and changing rooms—can carry a penalty of up to three years’ imprisonment or a fine of up to 3 million yen. Even without any intent, bringing your phone into the changing room itself can raise unnecessary suspicion. Make “leave it in the locker” your default.
The exception is the outdoor bath attached to your own guest room or a private bath you’ve reserved. Because these are private spaces, many inns allow photos there. Even so, the same rules apply on the way back from the changing room and in any shared areas. When you post to social media, take care that no other bathers appear in your photos.
When you’re planning an onsen trip with the whole family, there are a few rules worth knowing in advance. The biggest question is usually: from what age can boys no longer enter the women’s bath, and girls no longer enter the men’s bath?
This point has changed significantly in recent years. In December 2020, the Ministry of Health, Labour and Welfare (MHLW) revised the “Hygiene Management Guidelines for Public Bathhouses,” lowering the recommended age above which boys cannot enter the women’s bath, and vice versa, from “around 10 years old” to “around 7 years old.” The revision reflects the trend toward earlier physical development in children.
That said, the actual age limits are set by each prefecture’s ordinances and management guidelines, and there are regional differences.
| Age limit | Number of prefectures | Main areas |
|---|---|---|
| Mixed bathing not allowed from age 7 | 33 prefectures | Including Tokyo, Kanagawa, Kyoto, Hyogo, Fukuoka, Okinawa |
| Mixed bathing not allowed from age 8 | 5 prefectures | Aichi, Shiga, Tottori, Kumamoto, Miyazaki |
| Not specified by ordinance | 9 jurisdictions | Including Fukushima, Chiba, Niigata, Osaka, Nara |
Even in jurisdictions without an ordinance, separate management guidelines may set “no mixed bathing from age 7.” Don’t assume “it’s not in the ordinance, so it’s fine”—just follow the guidance posted at the onsen you visit.
For small children who are not yet of school age, there’s another point to be aware of: diapers. Many facilities decline to admit toddlers who are still in diapers to the large public bath for hygienic reasons. Swim diapers are often not accepted either. For families with infants and toddlers, the realistic choices are a family bath or in-room outdoor bath, or simply keeping the bathing time short.
As for children’s pricing, many facilities set elementary school children at about half the adult rate, with younger children even cheaper—often a flat fee of around 100 to 200 yen, or free.
And one of the most important requests: don’t let children swim or dive in the bath. The bath is not a pool. For your child’s safety and for other bathers, teach them that the bath is a place to soak quietly.
It’s fine to wear glasses while bathing—doing so can actually help you avoid slipping when you can’t see your feet. That said, in sulfur-rich waters and other strongly mineralized springs, metal frames may discolor or corrode, so plastic frames are the safer choice.
One thing that’s surprisingly easy to overlook is how you handle accessories. Rings, necklaces, earrings, and the like should always come off and go into your locker. Silver reacts with sulfur and turns black. Even 18-karat, 14-karat, and 10-karat gold can have their silver and copper alloy components oxidize. Platinum and pure gold are relatively resistant, but as a matter of protecting valuables, it’s wisest to take them off as well.
Onsen etiquette is not a complicated code, nor is it a wall meant to keep outsiders away. It is a shared language, polished over a long stretch of time, that allows strangers who slip into the same waters to feel at ease together.
Take off your clothes, pour water over yourself, wash your body, soak quietly. Behind each of these acts lies care for hygiene, respect for nature, and consideration for others. The more you know about onsen etiquette, the less restrictive the bath feels—and the more freely and deeply you can enjoy it.
So follow the customs, settle into the warmth of the water, and take one slow deep breath. The quiet sense of peace that people have found in these waters for more than a thousand years is there for you to share.
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