Checked against the National Police Agency’s and Tokyo Metropolitan Police Department’s official English-language pages on 18 September 2026. Local procedures and contact numbers vary by prefecture, so confirm details at the police station handling your case.

Leaving a wallet on a train seat in Kyoto or a phone on a bar counter in Osaka is the kind of moment that makes any traveler’s stomach drop. Japan is well known for returning lost items at unusually high rates, and there’s a real legal framework behind that reputation: the Lost Property Act (遺失物法). It sets out exactly what happens between the moment something is picked up and the moment it’s returned — and it puts a strict clock on nearly every step, for the finder as much as for the owner.

The finder has to report it within 7 days — 24 hours if picked up at a facility

Under the Act, anyone who finds a lost item on the street or in a public place has 7 days to report it to the police. If the item was found inside a facility with a manager — a train station, a department store, a hotel — the deadline shrinks to 24 hours, and the report goes to station or store staff first, who pass it on to police. Miss that window and the finder loses their legal rights over the item entirely: no claim to ownership if it’s never claimed, and no claim to a reward. That deadline is exactly why so many lost items in Japan get handed in quickly — it isn’t only civic-mindedness at work.

Once reported, the item is held at the local police station, or forwarded to a dedicated lost-property center — Tokyo’s is the Metropolitan Police Department’s Lost Property Center — where it’s cross-checked against reports from people who’ve lost something matching that description.

The reward is real, but it’s a private matter between finder and owner

If the owner is identified, the finder is entitled to a reward of 5% to 20% of the item’s value, paid directly by the owner. If the item was found inside a facility, that reward is halved to 2.5%–10%, split between the finder and the facility. The police don’t broker this — they explicitly stay out of the negotiation over amount or payment method, leaving it to the two parties to work out directly. The finder’s right to claim it expires one month after the item is actually handed back to its owner, so it isn’t open-ended.

Police can only hold an item for 3 months

The police station keeps a found item for 3 months from the day it’s reported. If no owner turns up in that time, the finder can claim ownership outright — but only within a further 2-month window; after that, unclaimed items revert to the local government. For a traveler who’s lost something, that 3-month mark is the deadline that matters: it’s worth checking back with the police, or the online portal your prefecture uses, before it passes.

Cards, phones and IDs can’t become the finder’s property

Wallets and phones are treated differently from ordinary lost items. Anything carrying personal information — credit cards, ID documents, phones — is excluded from the rule that lets a finder claim unclaimed property as their own. In practice, that closes off the scenario travelers worry about most: your card or phone ending up permanently in a stranger’s hands through the system itself. The real risk sits in the gap before it’s ever reported, which is why canceling the card or locking the phone remotely should happen before you file anything with police, not after.

If you’ve already left Japan, you can still claim it — with two catches

This is the part that matters most for a tourist rather than a resident: filing a report and then flying home doesn’t forfeit your claim to a lost item. You just need to leave a phone number or email address the police can reach after you’ve left, and — if you have one — the contact details of anyone in Japan who can pick the item up or handle correspondence on your behalf. If the item does turn up and needs to be mailed to you, the shipping cost is yours to cover, and cash is sent by registered mail with the envelope and postage deducted from the amount inside.

How Travel AI Rescue helps

Travel AI Rescue keeps the police box and prefectural lost-property contact for wherever you are in Japan one tap away, with the country code already attached, so you’re not hunting for a number in the minutes right after you realize something’s missing. It can show a Japanese-language card stating exactly what happened — “I lost my wallet on the train,” for instance — so station staff or a koban officer understand you immediately without a shared language. It also helps put together a clear written summary of what was lost, when and where, which is the same information a report or a reward negotiation will eventually ask you for, and it keeps your card numbers and passport details stored and readable on the device even with no signal, so you can start canceling a card the moment you notice it’s gone. It works differently from a staffed help desk, and it doesn’t negotiate a reward or decide ownership on your behalf — those stay with the police and the item’s owner — but it shortens the gap between noticing and acting. (Reward amounts, ownership after the holding period, and return logistics are decided by the police and the parties involved, not by Travel AI Rescue.)

Sources

• National Police Agency, “Information Site of Lost Belonging — If you have lost your belongings, please immediately file a Lost Property Report!” https://www.npa.go.jp/bureau/soumu/ishitsubutsu/otoshimono/en/index.html (accessed 18 September 2026).
• National Police Agency, “Information Site of Lost Belonging — You found a lost property at a facility or store, etc.” https://www.npa.go.jp/bureau/soumu/ishitsubutsu/otoshimono/en/pickedup-institution.html (accessed 18 September 2026).
• Tokyo Metropolitan Police Department, “Lost and Found.” https://www.keishicho.metro.tokyo.lg.jp/multilingual/english/finding_services/lost_and_found/lost_found.html (accessed 18 September 2026).