Onsen Etiquette — A Complete Guide for Visitors

Why Onsen Matter

Japan sits on the Pacific Ring of Fire, and its volcanic geology produces roughly 25,000 natural hot spring sources across the country. Bathing in these mineral-rich waters — called onsen — has been central to Japanese culture for centuries. It's not exercise, not swimming, not a pool party. An onsen is a place for quiet soaking, physical restoration, and mental stillness.

For visitors, an onsen experience is one of the most authentic and memorable things you can do in Japan. But it comes with a set of customs that can feel intimidating if you've never done it before. The rules exist for one reason: to keep the shared water clean and the atmosphere peaceful for everyone. Once you understand them, the whole process is simple.

What Is an Onsen?

An onsen is a bathing facility fed by natural geothermal spring water. By Japanese law, the water must contain specific minerals and meet a minimum temperature to qualify as a true onsen. This distinguishes them from sento (public bathhouses that use heated tap water) and hotel spas.

Onsen come in many forms:

• Rotenburo — outdoor baths, often with views of mountains, forests, or the sea
• Uchiburo — indoor baths within a building
• Kashikiri-buro — private baths you can reserve by the hour (ideal for couples, families, or anyone who prefers privacy)
• Ashiyu — free public foot baths found in many hot spring towns (fully clothed, no etiquette concerns)
• Ryokan onsen — baths within traditional Japanese inns, often included with your stay

Most onsen separate bathers by gender. Mixed-gender bathing (konyoku) exists but is increasingly rare and typically found only at rural or traditional facilities.

What to Bring

Most onsen provide the basics, but here's what you should have:

• Large bath towel — for drying off afterward (often provided at ryokan; available for rent at public onsen)
• Small wash towel — for washing your body and for modesty while walking around (often sold for ¥100–¥200 at the entrance)
• 100-yen coins — for shoe lockers and changing room lockers
• Hair tie — if you have long hair, it must be tied up so it doesn't touch the water
• Your own toiletries (optional) — many onsen provide soap, shampoo, and conditioner, but not all

Do NOT bring: swimsuits (not allowed), phones or cameras (strictly prohibited in bathing areas), jewelry (remove before bathing — metals can react with mineral water).

Step-by-Step: Your First Onsen Visit

Step 1: Arrival and Entry

When you arrive at the onsen facility, you'll see a small entryway (genkan) with shoe lockers or shelves. Remove your shoes and store them. If there's a coin-operated locker, you'll typically need a ¥100 coin.

Pay the entrance fee at the reception desk or at a ticket machine. Public onsen fees range from ¥200 to ¥1,000 depending on the facility. Ryokan onsen are usually included with your room.

Step 2: Find the Right Door

Onsen are separated by gender. You'll see two entrances marked with curtains (noren):

• 男 (otoko) = Men — usually a blue or dark-colored curtain
• 女 (onna) = Women — usually a red or pink curtain

At some facilities, the men's and women's sides swap daily, so check the signs each time you visit.

Step 3: The Changing Room

Enter the changing room (datsuijo). This is where you undress completely. Yes, completely. Bathing nude is required — swimsuits are not allowed and are considered unhygienic because they trap soap and contaminants.

Nobody is looking at you. This is completely normal in Japan, and everyone in the room is in the same situation. Store all your clothes and belongings in a locker or basket. The only things you take into the bathing area are your small wash towel and your locker key (if it has a wristband).

Step 4: The Washing Area — The Most Important Step

This is the golden rule of onsen etiquette: you must wash your entire body thoroughly before entering the bath water. The onsen is for soaking, not for cleaning. Entering the bath without washing first is the single biggest etiquette violation you can commit.

Here's how:

1. Find a washing station — you'll see a row of low stools, hand-held shower heads, faucets, and basins along the wall
2. Sit on the stool — always sit while washing. Standing and splashing water around is inconsiderate to others
3. Wash thoroughly — use soap and shampoo (provided or your own) to wash your entire body and hair
4. Rinse completely — make absolutely sure all soap suds are rinsed off before you move to the bath. Any soap residue in the onsen water is a serious breach of etiquette

Take your time with this step. Japanese bathers are thorough, and rushing through it is noticeable.

Step 5: Entering the Bath

Now for the best part.

1. Enter slowly — onsen water is hot, typically 40–42°C (104–108°F). Some baths are even hotter. Ease yourself in gradually. Never jump or splash.
2. Your small towel must NOT go in the water — this is a key rule. You have two options:
   • Fold it neatly and place it on the edge of the bath
   • Do what locals do: fold it, wet it with cool water, and place it on top of your head (this actually helps regulate your body temperature)
3. Keep your hair out of the water — tie long hair up before entering
4. Soak quietly — the onsen is a place for peaceful relaxation. Quiet conversation is fine, but keep your voice low. No loud talking, no phone calls (your phone shouldn't be anywhere near the bath anyway)
5. Don't submerge your head — keep your head above water

Step 6: Between Baths

Many onsen have multiple baths — indoor, outdoor, different temperatures, different mineral compositions. You can move between them freely. If you're moving from one bath to another, a quick rinse at the washing station between baths is courteous but not strictly required.

Stay hydrated. Many onsen have a water fountain or vending machine in the changing room area. Hot water bathing is dehydrating, so drink water before, during breaks, and after.

Step 7: Leaving the Bath

When you're done soaking:

1. Don't rinse off (optional but recommended to skip) — onsen water is rich in minerals that are beneficial for your skin. Most Japanese bathers don't rinse after soaking to let the minerals absorb. However, if you have sensitive skin or the water is strongly acidic or sulfuric, a quick rinse at the washing station is fine.
2. Wring out your small towel before leaving the bathing area
3. Dry off before entering the changing room — this is critical etiquette. Use your small towel to wipe as much water as possible from your body and feet before stepping back into the dry changing room. Dripping water all over the changing room floor is inconsiderate.
4. Use your large towel to dry off completely at your locker before getting dressed

The Tattoo Question

Historically, tattoos in Japan are associated with yakuza (organized crime), and many onsen have banned tattooed bathers. This policy is gradually changing as Japan welcomes more international visitors, but it remains common.

Your Options If You Have Tattoos

• Ask first — call ahead or check the facility's website. Many onsen now state their tattoo policy explicitly
• Cover small tattoos — some onsen allow entry if tattoos are covered with waterproof bandages or special tattoo-cover patches (available at drugstores and online)
• Book a private bath (kashikiri-buro) — this is the most reliable option. Private baths are available at many ryokan and onsen facilities, typically for ¥2,000–¥5,000 per hour. No one will see or question your tattoos
• Choose a tattoo-friendly facility — cities like Beppu are known for being tattoo-friendly, and the number of accepting facilities is growing nationwide. Some major onsen chains have recently changed their policies to welcome tattooed guests
• Stay at a ryokan with an in-room bath — many luxury ryokan offer rooms with private rotenburo (outdoor baths) attached, giving you complete privacy

The Trend

The situation is improving. A growing number of facilities, particularly in tourist-heavy areas, have relaxed their tattoo policies. The Japan Tourism Agency has encouraged onsen operators to accommodate international visitors. But "improving" doesn't mean "resolved" — always check before you go.

Onsen Types and What to Expect

By Mineral Content

Different onsen contain different minerals, each with claimed health benefits:

• Sulfur (iou-sen) — milky white water with a distinctive egg-like smell. Said to benefit skin conditions. Common in Hakone, Noboribetsu, and Kusatsu
• Sodium chloride (en-ka-butsu-sen) — salty water that retains heat well. Said to improve circulation. Common in coastal areas
• Iron (tetsu-sen) — reddish-brown water. Said to help with anemia and cold sensitivity
• Carbon dioxide (tan-san-sen) — fizzy, effervescent water. Said to improve blood flow. Relatively rare and highly prized
• Simple thermal (tan-jun-sen) — clear, mild water suitable for sensitive skin. The most common type

By Setting

• Mountain onsen — surrounded by forest, often with rotenburo overlooking valleys
• Coastal onsen — ocean views, sometimes with waves crashing nearby
• Urban onsen — modern facilities in cities, often with saunas, cold plunge pools, and relaxation rooms (sometimes called "super sento")
• River onsen — natural pools in riverbeds where hot spring water mixes with river water (like Kawayu Onsen in Wakayama)

Common Mistakes to Avoid

1. Entering the bath without washing first — the number one violation
2. Putting your towel in the bath water — keep it on your head or on the edge
3. Wearing a swimsuit — nudity is required in shared baths
4. Being loud — keep conversation quiet and respectful
5. Taking photos — phones and cameras are absolutely prohibited in bathing and changing areas
6. Running or splashing — move calmly and deliberately
7. Entering the changing room while dripping wet — dry off first
8. Soaking too long on your first visit — the heat can cause dizziness. Start with 10–15 minutes and take breaks

The Rhythm of an Onsen Stay

If you're staying at a ryokan with an onsen, there's a traditional rhythm to the experience:

1. Arrive and change into your yukata (cotton robe provided by the ryokan)
2. First bath — soak before dinner to relax after traveling
3. Kaiseki dinner — a multi-course traditional meal, often served in your room
4. Second bath — a nighttime soak before bed, when the baths are often quieter
5. Sleep on futon — laid out on tatami mats by the staff while you were at dinner
6. Morning bath — an early soak before breakfast, often the most peaceful time
7. Breakfast — traditional Japanese breakfast with rice, miso soup, grilled fish, and pickles

This bath-meal-bath-sleep-bath cycle is one of the most deeply relaxing experiences Japan offers. It's worth building at least one night at a ryokan into your itinerary specifically for this.

The Bottom Line

An onsen visit is not complicated. Wash before you soak, keep your towel out of the water, be quiet, and respect the space. That's genuinely all there is to it. The nervousness that first-timers feel — about being naked, about doing something wrong, about the unfamiliar setting — dissolves within minutes of settling into the warm mineral water.

The Japanese have been doing this for over a thousand years. There's a reason it endures. The combination of hot mineral water, clean mountain air, and enforced stillness creates a kind of relaxation that no spa treatment can replicate. It's not a luxury add-on to your trip. It's one of the essential experiences of being in Japan.

JEMS makes sure you don't miss it.