日本の温泉マナー＆タトゥーガイド 2026|入り方・NG行為

Onsen is Japan at its most Japanese — communal bathing in mineral hot springs. It's also the biggest source of first-timer anxiety. Here's what you actually need to know.

The 10 core onsen rules

• ●1. Be naked — swimsuits forbidden. This is not optional.
• ●2. Onsen is gender-segregated — most have men's + women's sides
• ●3. Wash BEFORE entering the tub — full shower at seated stations, use soap + rinse
• ●4. Small towel etiquette — don't put it in the water; fold on head or leave at side
• ●5. Tie up long hair — hair in the water is a big taboo
• ●6. No phones anywhere in bathing area — no photos, ever
• ●7. No talking loudly — onsen is a meditative space
• ●8. Don't rush — soak for 10-15 min, cool down, repeat
• ●9. Drink water between soaks — dehydration is real
• ●10. Dry off before leaving the bathing room — don't drip on the changing room floor

The tattoo situation (2026 reality)

Historically, tattoos = yakuza. Public onsen still often ban tattoos. But 2026 is changing — tour^PRist areas increasingly accept tattoos, and pre-2020 Olympic push made ryokan more flexible. Small tattoos coverable with sticker (¥600 at Amazon) usually pass. Large tattoos = book tattoo-friendly places.

Tattoo-friendly onsen in Japan (verified 2025)

Small tattoo cover-up hack

For tattoos under 10cm, buy tattoo cover-up stickers on Amazon Japan (search 'tattoo cover seal') — ¥600 for 20 pieces. Waterproof for 30-45 min in onsen. Works for maybe 1 hour before needing replacement. Perfect for 1-2 wrist/ankle tattoos.

First-time onsen: step-by-step

• ●1. Enter through gender-color-coded curtain (blue男 / red女)
• ●2. Remove clothes in changing room — put in a locker or basket
• ●3. Take small towel — usually provided, or bring your own
• ●4. Enter bathing room, sit at washing station — shower, soap, rinse fully
• ●5. Rinse the seat + area — pour water bucket over your spot
• ●6. Enter the onsen tub slowly — very hot (40-45°C)
• ●7. Soak 10-15 min max first time — cool down at edge, repeat
• ●8. Optional: rinse off in shower before returning to changing room
• ●9. Dry off with towel before leaving bathing room
• ●10. Dress + rest in lounge — hydrate with water/tea

Onsen types + what they cure

• ●Sulphur (yumoto) — skin issues, muscle recovery
• ●Chloride (shio) — cuts + wounds heal faster, warms body long-term
• ●Iron (tetsu) — anemia + circulation improvement
• ●Carbon dioxide (tansan) — heart + circulation improvement
• ●Simple hot spring — general relaxation + fatigue