A guide to Japanese public baths from people who never had to think about any of this until someone asked.
Here’s something we realised while writing this article: none of us had ever been taught how to use a public bath.
We asked around the team. Nobody could remember a lesson, a rule explained, a moment of being corrected. You just go with your family when you’re four years old, and by the time you’re old enough to notice there are rules, you’ve already absorbed all of them. Ask a Japanese person why you can’t put your towel in the water and most of us will pause, because the honest answer is “I don’t know, you just don’t.”
That’s exactly why this article is hard to find written down anywhere, and exactly why we’re writing it.
So we went back and actually worked out the reasons. Not just the rules, but why each one exists — because a rule you understand is one you’ll remember at the moment it matters, standing naked in a room full of strangers, which is not the ideal moment to be guessing.
None of this is as intimidating as it sounds. Japanese bathing culture is genuinely welcoming, and nobody is watching you as closely as you think. But there are about six things that will get you a look, and two that will get you asked to leave, and you deserve to know which is which before you go.
First: what kind of bath are you actually going to?
These words get used interchangeably in English-language travel writing, and they mean genuinely different things.
Sento (銭湯) is a neighbourhood public bath, filled with heated tap water. Historically these existed because homes didn’t have baths. Prices are regulated by each prefecture, so a sento costs roughly the same everywhere within a region — usually somewhere around ¥500–600. Many are decades old, run by an elderly couple, cash only, and are among the most quietly wonderful places in this country.
Onsen (温泉) is a hot spring. This is a legal designation in Japan, not a marketing term — to call itself an onsen, the water has to come from a geothermal source and meet defined criteria for temperature or mineral content. The water will often be coloured, cloudy, or smell distinctly of sulphur. Day-use entry at an onsen typically runs ¥800–2,000.
Super sento (スーパー銭湯) is the modern leisure version: a large complex with multiple baths, saunas, restaurants, massage chairs, and often a reclining lounge where you can sleep. Usually ¥1,000–3,000. These are the ones open late or around the clock, and they’re the most forgiving place to have your first experience.
The etiquette below is the same in all three. What changes is the atmosphere: a sento is a neighbourhood institution and quieter, a super sento is closer to a leisure facility, and a mountain onsen is somewhere between a spa and a religious experience.
Before you go: four things to sort out first
Check the tattoo policy — really check it
We’re putting this first because it’s the single most common reason a visitor gets turned away at the door, and finding out at the entrance after a 40-minute train ride is a miserable way to learn.
Many Japanese bath facilities refuse entry to guests with visible tattoos. The reason is historical: tattoos were strongly associated with organised crime, and bath houses banned them to keep that clientele out. That association is fading — genuinely, and faster in the last few years than in the twenty before — but the policies outlived the reasoning, and plenty of facilities have simply never revisited the rule.
- Fully tattoo-friendly. Increasingly common at newer facilities and in areas with lots of foreign visitors. Often stated in English on their website.
- Cover it and you’re fine. Skin-coloured tattoo cover patches (タトゥーシール) are sold at drugstores, Don Quijote, and some convenience stores. This works for small pieces. It does not work for a full sleeve.
- No tattoos, no exceptions. Still common at traditional sento and older ryokan.
The reliable workaround: a private bath. Look for kashikiri-buro (貸切風呂) or kazoku-buro (家族風呂) — a private bath you rent by the hour, usually ¥2,000–5,000 for 45–60 minutes. Tattoo rules generally don’t apply because nobody else is in there. Many ryokan also offer rooms with a private open-air bath. If you have significant tattoos and want the onsen experience without the anxiety, this is the answer, and honestly it’s a lovely experience in its own right.
To check ahead, this is the phrase to send or show:
タトゥーがありますが、入浴できますか？ Tattoo ga arimasu ga, nyūyoku dekimasu ka? “I have tattoos — am I able to bathe here?”
Know that swimwear is never an option
This surprises people, so let’s be direct: you bathe naked. Not partially, not in swimwear, not wrapped in a towel. Everyone in the room is naked, including the 80-year-old regular and the small child running past.
We understand this is the largest barrier for most Western visitors, so here’s the honest reassurance: nobody looks. Genuinely. There is a well-understood social agreement that eyes stay at face level or on the water, and it is observed absolutely. Within about four minutes you’ll stop thinking about it. Almost everyone reports the same thing.
The only exception is a small number of mixed-gender baths (混浴, konyoku) which sometimes permit a bathing wrap, and a handful of modern facilities with swimsuit-required areas. These are clearly signposted as such. The default is naked.
Bring, or be prepared to buy, the right towels
- A small towel (roughly hand-towel size) goes into the bathing area with you. It’s for washing, for modesty while walking, and for drying off at the end.
- A large towel stays in your locker in the changing room.
Traditional sento often don’t provide either, and may not provide soap or shampoo. Most sell or rent them for a small fee at the front desk, but check. Super sento and onsen facilities almost always provide amenities.
Take off your silver jewellery
If you’re going to a sulphur onsen, silver will tarnish black. This is a chemical reaction and it is not reversible at the bath house. Leave it in the locker.
The actual process, step by step
There will be a shoe locker or a shelf immediately inside the door. Shoes come off before you reach the front desk, not after. Some lockers use a wooden key; some take a ¥100 coin which is returned when you retrieve your shoes.
Payment is at a front desk or, at older sento, at a bandai (番台) — a raised seat between the two changing rooms where the owner sits. Many sento are cash only.
Then, the noren curtains:
- 男 — men
- 女 — women
Curtain colour is usually blue or navy for men and red or pink for women, and we want to flag clearly that this is a convention, not a rule. Some facilities swap the men’s and women’s sides daily, so the different baths get shared fairly. Read the character, not the colour. If you remember one piece of kanji from this article, make it these two.
Everything goes in the locker or basket, including underwear. Take your small towel with you. Leave your phone in the locker — photography in the changing room or bathing area is completely prohibited, without exception, and this is one of the two things that will get you removed from the premises. Don’t take your phone in even to check the time.
Tie long hair up. Hair must not touch the bath water.
This is the rule that matters most, and the one most often broken by visitors.
You do not get into the bath dirty. Before you enter any bath, you rinse. There are two acceptable ways:
- Kakeyu (掛け湯) — use the small basin or ladle near the bath, scoop water from the bath, and pour it over yourself several times. Start with your legs and work up, which also helps your body adjust to the heat.
- Wash properly at a shower station first (see next step).
At minimum, do kakeyu. If you’ve been walking around a city all day, do the full wash.
The reason is simple and it’s worth internalising: the bath water is not drained between users. Everyone shares it, all day. The bath is for soaking, not for cleaning — the cleaning happens outside it. Once you see the bath as shared water rather than as a bathtub, every rule in this article follows logically.
Along the walls you’ll find rows of low shower stations, each with a small plastic stool, a bucket, a shower head, and usually soap and shampoo.
Sit on the stool. Don’t stand. Standing sprays water and soap onto the people either side of you, and this is the most common thing visitors do that earns a look from the regulars.
Wash thoroughly. Rinse thoroughly — no soap foam should remain on you when you get in the bath. Take your time; this is a normal, unhurried part of the process, not a formality to rush through.
When you finish, rinse the stool and the area around it with your bucket for the next person. This small act is the single clearest signal that you know what you’re doing.
Move slowly. Onsen water is often hotter than you expect — 40–43°C is normal, and some baths run hotter. Enter gradually rather than all at once.
Your towel does not go in the water. Fold it and put it on your head — the classic image is a real thing people actually do — or set it on the edge of the bath. Along with rinsing before entry, this is the rule Japanese people notice.
Then:
- Keep your voice down. Conversation is fine; volume is not. A bath house is a quiet room.
- No swimming, no splashing, no going underwater.
- Don’t put your face or head in the water.
- Don’t wash, shave, or scrub in the bath.
- Don’t stare. Eyes at face level or on the water.
Most facilities have several: a main hot bath, sometimes a cooler one, a rotenburo (露天風呂) outdoor bath, jet baths, and often a sauna with a cold plunge pool (mizuburo, 水風呂).
Two things about saunas: wipe or rinse your sweat off before entering the cold plunge, and if there’s a bench towel, sit on it. The rotenburo is generally the best bath in any facility — an outdoor bath in winter, with cold air on your face and snow around you, is one of the genuinely great experiences available in this country, and worth the trip on its own.
Hot water is more physically demanding than it feels. If you get lightheaded, get out immediately and sit down — this happens to Japanese people too and there’s nothing embarrassing about it.
The normal pattern is to alternate: soak for five to ten minutes, get out and cool down, go back in. Drink water before and after. Don’t bathe drunk, and don’t bathe on a completely empty stomach.
This is a small rule with a big effect: use your small towel to wipe yourself down while still in the bathing area, before you step back into the changing room. Wring it out and wipe again if you need to.
Nobody wants to stand on a soaked floor to get dressed, and the changing room floor is usually tatami or wood. Dripping your way across it is impolite in a way that’s obvious once you think about it and invisible until someone tells you.
If you’ve been to a real onsen, consider not rinsing the mineral water off at the end — the minerals are the point, and rinsing them away undoes some of the benefit. This is personal preference, though; if the water was heavily sulphuric and you have plans, rinse.
Then, the part we’d genuinely recommend: find the drinks fridge and get a bottle of milk. Plain milk, coffee milk, or fruit milk, drunk cold while you’re still overheated, with one hand on your hip. There is no functional reason for the hand on the hip. Everyone does it anyway. It’s been done since the 1950s and it is, as far as we can determine, entirely traditional and entirely pointless, which is our favourite kind of custom.
Things people worry about that turn out to be fine
Being the only foreigner there. Common at neighbourhood sento, and not a problem. If anything, regulars tend to be pleased. You may get a nod or a short conversation.
Not speaking Japanese. The whole process is non-verbal. You pay, you point if needed, you bathe. Staff at facilities near tourist areas usually have English signage.
Body hair, body shape, scars, surgical marks. Not an issue. The room contains bodies of every possible description and nobody registers any of it.
Glasses. Fine to wear in. Contact lenses are best removed — onsen water isn’t sterile and getting it in your eye with lenses in is a genuinely bad idea.
Being on your period. Japanese custom is not to enter the shared bath. A private bath, a rotenburo at your own accommodation, or another day is the usual approach.
Children. Kids bathe with a parent. Age limits for entering the opposite-gender changing room vary by prefecture — generally somewhere around seven to nine years old — and are posted at the entrance.
Two things that will actually get you removed
Everything above is etiquette. Break it and you’ll get a look, maybe a quiet word, and it will be fine.
These two are different:
- Taking a photo. In the changing room or the bathing area, at any time, of anything. There is no acceptable version of this. Leave your phone in the locker.
- Getting in without washing. If it’s obvious and repeated, staff will intervene.
That’s the whole list. Everything else is recoverable.
Where to start
If you’ve never done this before, our honest recommendation is to start at a super sento rather than a traditional neighbourhood bath. There’s English signage, amenities are provided, tattoo policies are more likely to be relaxed, and the larger space makes the whole thing less exposed. Once you’ve done it once, a small local sento becomes a much more comfortable prospect — and that’s where the atmosphere really is.
Go on a weekday afternoon if you can. Evenings between about 18:00 and 20:00 are the busiest, especially at neighbourhood sento when people arrive after work.
Spa complex：スーパー銭湯(Super sento）
The rule behind all the rules
Writing this out, we noticed something we’d never articulated before. Every single rule in this article comes from the same place: the water is shared, and the room is shared.
Wash first, because the water is shared. Keep your towel out, because the water is shared. Rinse the stool, because the space is shared. Keep your voice down, dry off before you walk out, don’t stare — because the room is shared, and everyone in it is more exposed than they’d usually be, and the entire thing only works because everyone quietly agrees to protect that.
That’s it. That’s the whole logic. If you’re ever unsure about something we haven’t covered, ask yourself which choice is more considerate of the next person, and you will be right nearly every time.
We didn’t know we knew that until we tried to explain it. Which is more or less the reason this site exists.
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