Series · Everyday Life · 8 of 8

Japan's public bathhouses, and what they were really for

Japan built its neighborhoods in the bath.

8 storiesUpdated 28 August 2026

A room where strangers undress and share hot water sounds like the least sociable place imaginable. In Japan it was the center of the neighborhood.

The sento made sense because most homes in Edo, and well into the twentieth century, had no bath of their own. The bathhouse was where the town met, and everything inside it — the painted wall, the attendant's high seat, the yellow bucket, the bottle of milk on the way out — grew out of daily use rather than out of design.

Across eight parts we read the room: why Mount Fuji is on the wall and who it was painted for, what the raised booth by the door was doing, why the most famous bath bucket in Japan is an advertisement for a painkiller, how the curtain at the entrance tells you whether the bath is open, the two rules you follow before getting in, and why there is a fridge full of milk.

The numbers frame the story: 17,999 bathhouses at the 1968 peak, about 2,847 facilities today. The last part is about the people trying to stop that number falling.

Watch in order

What this series answers

8 questions, each answered in one short and one article, and each traced to a primary source you can check yourself.

What is a sento, and why did it matter so much?: A sento is Japan's public bathhouse, and in Edo, when most homes had no bath of their own, it doubled as the town's living room. Read →
Why is Mount Fuji painted on Japanese bathhouse walls?: It began as a gift for children. Read →
What is the bandai in a Japanese bathhouse?: The bandai is the raised attendant's booth by the entrance, where fees are collected and the changing room is kept safe. Read →
Why is Japan's yellow bath bucket called Kerorin?: Because it was an advertisement. Read →
How do you know if a Japanese bathhouse is open?: The noren tells you. Read →
What are the rules before you get into a Japanese public bath?: Two, straight from the Tokyo Sento Association's official etiquette guide: rinse your body with kakeyu before entering the tub, and never let your towel touch the shared bathwater. Read →
Why do people drink milk after a bath in Japan?: Because the bathhouse had the refrigerator. Read →
Are Japan's sento disappearing?: Numbers keep falling — about 2,847 facilities remain — and aging buildings struggle. Read →