The age is 20, not 18
Japan lowered its legal age of adulthood to 18 in 2022, but alcohol (and tobacco) stayed at 20 under a separate law, the Minor Drinking Prohibition Act. This applies to everyone — residents, exchange students, and tourists alike, regardless of your home country’s drinking age.
It’s enforced on foreigners too
There’s no tourist exception. Konbini, bars, and izakaya increasingly use touchscreen or ID-scan age checks for anyone who looks young, and staff can refuse service without one. Carry a passport (or a photo of it) if you look under 30.
Public drinking is legal
Unlike the US, Japan has no general open-container law — drinking in parks, on trains (outside rush hour), or at a konbini-adjacent curb is legal and common, especially during hanami season. The age rule still applies; being in public doesn’t relax it.
Vending machines and konbini
Alcohol vending machines still exist but are far less common than a decade ago, and many require an age-verification card (Taspo) that tourists won’t have. Convenience stores are the reliable option — just expect an ID check at the register.
No tolerance for drunk driving
Japan’s drunk driving laws are strict and cover even small amounts — there’s no “under the limit” buffer. Passengers, and anyone who knowingly let a drunk person drive, can also be penalized.
The bottom line
If you’re 20 or older, this rarely comes up beyond an occasional ID check. If you’re a younger visitor or traveling with teenagers, expect the rule to be enforced consistently, with no allowance for a lower home-country age.