Sentō & Onsen in Tokyo

Sentō, onsen and what's the difference

Communal bathing is woven deep into Japanese life, and Tokyo lets you experience it without leaving the city. The everyday version is the sentō (銭湯), a neighbourhood public bathhouse heated with ordinary tap water — historically the place locals went to bathe before homes had their own tubs, and still a warm, sociable institution in many districts. The prized version is the onsen (温泉), where the water comes from a natural hot spring rich in minerals; true onsen are abundant in the mountains and resort towns around Japan but exist within Tokyo too, including some surprisingly dark, mineral-heavy 'black water' (kuroyu) springs. Between them sits a modern category often called a 'super-sentō' — large leisure bathhouse complexes with multiple baths, saunas, outdoor tubs, relaxation lounges and restaurants, built for a half-day of unwinding rather than a quick wash.

For a visitor the distinctions matter less than the shared ritual, which is the same across all of them: you arrive, undress completely, wash thoroughly, then soak in hot communal water. A retro local sentō is the most authentic and affordable slice of daily Tokyo; an onsen offers genuine spring water; a super-sentō is the most comfortable, facility-rich choice for a long, lazy session. Any of the three is a wonderful experience once you know the etiquette — which is what trips up most first-timers, so it's worth getting right.

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Bathing etiquette: the rules that matter

The single most important rule is that the bath is for soaking, not washing — you must be clean before you enter the shared water. After paying and storing your shoes and clothes in the changing-room lockers, you go in naked (baths are sex-segregated; the curtains are usually blue/男 for men and red/女 for women) carrying only a small towel. At the bathing area you sit on a low stool at one of the seated shower stations and wash and rinse your entire body thoroughly, keeping the water and suds to your own space. Only once you are properly rinsed do you get into the bath, and you keep your small towel out of the water — fold it and rest it on the rim or, as most people do, on top of your head. Don't put your head or hair under the bathwater, don't swim or splash, and keep your voice low.

A few more courtesies round it out: tie up long hair so it doesn't touch the water; don't bring your phone or camera into the bathing area at all (photography is a hard no, for everyone's privacy); enter and exit calmly; and rinse off and dry roughly with the small towel before stepping back into the changing room so you don't drip everywhere. When you're done, the etiquette is simply to leave the space as clean as you found it. None of this is difficult — it's mostly common-sense cleanliness and quiet — but doing it confidently is the difference between feeling out of place and blending in.

• Wash and rinse completely at the seated showers before entering the bath — you soak clean.
• Naked, sex-segregated, no swimsuits; carry only a small towel and keep it out of the water (rest it on your head).
• No head/hair under the water, no swimming or splashing, voice low.
• Absolutely no phones or photos in the bathing area; tie up long hair.
• Dry off roughly with the towel before returning to the changing room.

Tokyo Etiquette Guide

Shoes-off rules, quiet and the wider Japanese courtesies that carry into a bathhouse.

Tattoos: the honest situation

Tattoos are the most common worry for visitors, and the honest answer is: it depends, so check ahead. Historically, tattoos in Japan carried an association with organised crime (the yakuza), and many baths adopted blanket 'no tattoos' rules to keep that element out. Those rules have softened unevenly with the rise of foreign visitors and tattooed travellers, but they haven't disappeared. Today you'll find the full range: some sentō and complexes admit tattoos without comment, some ask that a small tattoo be covered with a skin-coloured patch (sold at convenience stores and sometimes at the bath), and some — often the larger, family-oriented complexes — still refuse entry to anyone with visible tattoos, large or small.

Because there is no city-wide rule, the practical move is to confirm a specific bath's tattoo policy before you go rather than risk being turned away at the desk. Tattoo-friendly bathhouses do exist and are findable, and a cover patch solves the problem at many of the stricter ones if the tattoo is small. If you'd rather sidestep the issue entirely, a private bath — available at some ryokan, hotels and certain onsen facilities as a bookable family/private bath (kashikiri) — lets you bathe without any tattoo question at all. We don't list which venues allow what, as policies change; treat it as a phone-call-ahead detail.

• Policies vary widely — some baths allow tattoos, some require a cover patch, some refuse entry.
• Cover patches (sold at convenience stores) solve small tattoos at many stricter baths.
• A bookable private/family bath (kashikiri) avoids the tattoo question entirely.
• There's no city-wide rule — confirm a specific bath's policy before you go.

Local sentō vs the big complexes

Which kind of bath to choose comes down to mood. A small old-school neighbourhood sentō is the most atmospheric and affordable: often a wonderful retro space — tiled murals (frequently of Mount Fuji), high ceilings, a few hot tubs of varying temperature, maybe a cold plunge or an electric bath — used by locals as part of daily life. You pay a modest set entry, bring or rent a tiny towel and a sachet of soap, and you're in and out in under an hour. These reward the curious traveller who wants a genuine, unpolished slice of Tokyo, and several photogenic old sentō have become quietly beloved. They're best for a quick, characterful soak rather than a long lounge.

The big 'super-sentō' and onsen complexes are the opposite proposition: pay a larger entry and you get a whole leisure facility — multiple indoor and outdoor baths, jet baths, saunas and steam rooms, cold plunges, relaxation lounges with reclining chairs, sometimes massage and always food. Some are spring-fed onsen; many are designed for spending hours, even napping, and make an excellent rainy-day base. They're more tourist-friendly (signage, towels included, sometimes English) but less intimate. A simple rule of thumb: pick a local sentō for authenticity and a quick reset, and a complex for a long, comfortable, facilities-rich relaxation session.

• Local sentō: cheap, retro, characterful (often a Fuji wall mural) — best for a quick, authentic soak.
• Super-sentō / onsen complexes: bigger entry fee, many baths, saunas, lounges and food — best for a long lounge.
• Complexes are more tourist-friendly (towels, signage); local sentō are more intimate.

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When to bathe: rainy days and jet lag

A Tokyo bath earns its place in a trip as much for timing as for tradition. It is one of the city's best rainy-day moves: indoor, weather-proof, and far more restorative than another shopping arcade, a sentō or bathing complex turns a washout afternoon into a highlight. It's also the smart cure for the two great enemies of a Japan trip — jet lag and tired feet. A hot soak in the late afternoon or evening resets your body clock and unknots a day of pavement-pounding, and many bathers swear by it for sleeping soundly through the first disorienting nights. Hydrate well before and after, don't bathe on a very full stomach or after drinking, and ease out gently if the water is hot.

Practically, bring or rent a small towel and a larger one, a little soap/shampoo (often sold or stocked), and a hair tie; many baths also sell these at the desk. Plan to relax rather than rush — even a quick sentō visit deserves a slow exit and a cold drink afterwards (the post-bath bottle of milk or coffee-milk is a beloved ritual). As ever, we keep specific venues, prices, hours and tattoo policies out of the prose because they vary bath to bath and change; choose a sentō, onsen or complex that fits your mood, confirm its details and tattoo policy, and enjoy one of Tokyo's most quietly perfect pleasures.

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Sentō & onsen in Tokyo at a glance

Use this card to bathe with confidence. The etiquette and the sentō/onsen/complex distinctions are evergreen; specific venues, prices, hours and tattoo policies vary widely and change, so verify those — and any tattoo rules — for the bath you choose.

• What's what: sentō (tap-water public bath), onsen (natural hot spring), super-sentō (big leisure complex).
• The rule: wash and rinse completely before entering the bath; naked, sex-segregated, no swimsuits.
• Towel out of the water (rest it on your head); no phones, photos, splashing or hair in the water.
• Tattoos: policies vary — check ahead; cover patches or a private bath are workarounds.
• Choose: a local sentō for a quick authentic soak; a complex for a long, facility-rich lounge.
• Great for: rainy days, jet lag and tired feet; verify each bath's price, hours and tattoo rules.

What is the difference between a sentō and an onsen?

A sentō (銭湯) is a neighbourhood public bathhouse heated with ordinary tap water — historically where locals bathed before homes had their own tubs, and still a warm, sociable institution. An onsen (温泉) uses naturally heated, mineral-rich hot-spring water; true onsen are abundant in the mountains around Japan but exist within Tokyo too, including some dark, mineral-heavy 'black water' (kuroyu) springs.

Between them sits the 'super-sentō' — a large leisure complex with multiple baths, saunas, outdoor tubs, lounges and food. For a visitor the bathing ritual is identical across all three; the differences are the water source, price and facilities.

Can you go to a Tokyo bathhouse with tattoos?

It depends, so check ahead. Historically tattoos carried an association with organised crime, and many baths adopted blanket 'no tattoos' rules. Those have softened unevenly: some baths now admit tattoos without comment, some ask that a small one be covered with a skin-coloured patch (sold at convenience stores), and some — often larger family complexes — still refuse entry to anyone with visible tattoos.

Because there's no city-wide rule, confirm a specific bath's policy before you go. Tattoo-friendly bathhouses exist and are findable, and a bookable private/family bath (kashikiri) sidesteps the question entirely.

Do you wear a swimsuit in a Japanese bathhouse?

No. Bathing is done completely naked, and the baths are sex-segregated (the entrance curtains are usually blue/男 for men and red/女 for women). Swimsuits are not worn in the communal baths.

You carry only a small towel for modesty and washing, but you keep it out of the bathwater — fold it and rest it on the rim or, as most people do, on top of your head. If you'd prefer not to bathe communally naked, a private bath (kashikiri) at some ryokan, hotels and onsen facilities is the alternative.

What is the etiquette for using a sentō or onsen?

The single most important rule is to wash and rinse your entire body thoroughly at the seated shower stations before you ever enter the bath — you soak already clean. Keep your small towel out of the water, don't put your head or hair under the water, and don't swim, splash or speak loudly.

A few more: tie up long hair, never bring a phone or camera into the bathing area (photography is a hard no, for everyone's privacy), enter and exit calmly, and dry off roughly with your towel before stepping back into the changing room. It's mostly common-sense cleanliness and quiet.