You arrive home and cannot find your apartment key. Start with a quick check of your bag and the places you last used it, then call the landlord or rental management company using the contact on your lease or resident guide. Ask how to get in and whether the lock needs changing. If the key may be lost outside, also check with the place you visited and file a lost-property report.
Japanese words you may need
| Japanese | Reading | Meaning |
|---|---|---|
| 鍵を紛失した | かぎをふんしつした (kagi o funshitsu shita) | I lost the key |
| 部屋に入れない | へやにはいれない (heya ni hairenai) | I cannot get into my apartment |
| 管理会社・大家 | かんりがいしゃ・おおや (kanri gaisha / ōya) | Management company / landlord |
| 緊急連絡先 | きんきゅうれんらくさき (kinkyū renrakusaki) | Emergency contact |
| 開錠・解錠 | かいじょう (kaijō) | Unlocking |
| 鍵交換 | かぎこうかん (kagi kōkan) | Lock or key replacement |
| 見積書・出張費・キャンセル料 | みつもりしょ・しゅっちょうひ・キャンセルりょう | Written estimate / call-out fee / cancellation fee |
| 遺失届 | いしつとどけ (ishitsu todoke) | Lost-property report to police |
First calls when you are locked out
- Check whether a trusted household member has a legitimate spare. Do not try to force the door or change a shared building lock.
- Find the rental contact in your lease, move-in papers or building notice. Explain the building and room number, whether you are locked out, and when and where the key may have gone missing. Ask for the approved way to regain access, including any night or holiday contact.
- Ask whether the key or cylinder should be replaced, who arranges it, and what costs you may have to pay. Do not order a lock replacement yourself before consulting the landlord or manager. Tokyo’s consumer center says a landlord’s consent is needed for replacement in a rental home; a property manager likewise directs tenants to the rental agent or unit owner. See Tokyo’s key-loss guidance and Daikyo Astage’s tenant FAQ.
A lost key may need more than simply opening the door, especially if something on the key ring identifies your address. Tell the manager those details so they can assess security and replacement. The fee and method depend on your contract, lock and circumstances; ask for a breakdown rather than assuming a fixed national price.
Search and report the lost key
Contact the station, shop or other facility where you may have left it. Check with the building office if it keeps found items. If it has not turned up, file a 遺失届 with the police. The National Police Agency’s lost-property page links to each prefecture’s reporting and search options; online availability varies, and urgent reports can be made at a police station or kōban. A lost-property report helps the police contact you if an item is found; it does not itself arrange entry to your home.
If you need a locksmith
Ask the manager first whether it has an approved provider or assistance plan. If you must arrange a service, explain the type of lock and situation, and ask before the visit about the likely total, night surcharge, call-out fee and cancellation fee. On arrival, request a written estimate and approve any additional work before it starts. Tokyo’s consumer center has documented unexpectedly high bills after low advertised starting prices and recommends checking the work and costs in advance. Read its current advisory. If a charge is very different from what was explained, keep the documents and contact your local consumer affairs center; the national consumer hotline is 188.
Short phrases for the phone
- 賃貸の部屋の鍵をなくして、部屋に入れません。 Chintai no heya no kagi o nakushite, heya ni hairemasen. — I lost my rental apartment key and cannot get in.
- 夜間の緊急連絡先を教えてください。 Yakan no kinkyū renrakusaki o oshiete kudasai. — Please tell me the after-hours emergency contact.
- 鍵の交換は必要ですか。誰が手配しますか。 Kagi no kōkan wa hitsuyō desu ka. Dare ga tehai shimasu ka. — Is a lock change needed? Who arranges it?
- 作業前に見積書をお願いします。 Sagyō mae ni mitsumorisho o onegai shimasu. — Please provide a written estimate before the work.
For other issues to report to your rental manager, see how to report an apartment repair. When preparing to leave the property, check the key return instructions in our moving-out checklist. Our Japanese apartment guide connects the search, move-in and ongoing rental tasks.
