How To Verify A Property Seller Is The Real Owner In Japan

What jimenshi fraud actually looks like

A jimenshi scheme needs three things to work: a property whose real owner is hard for a buyer to reach or cross-check directly, a person willing to impersonate that owner in meetings and at the notary, and forged or stolen paperwork that can pass for the real thing — a driver's license or passport, a seal registration certificate (印鑑証明書), a certificate of residence (住民票), and either the physical registration identification information (登記識別情報) or a plausible explanation for why it cannot be produced. Vacant land, an unoccupied building, or a property whose registered owner is elderly, lives far away, or has died without the inheritance being registered are the classic profiles, because in each case there is no one nearby routinely handling the property who would notice a stranger claiming to be the owner.

The Sekisui House case, in brief

The property at the center of the 2017 case was the site of a shuttered inn (旅館「海喜館」) in Nishi-Gotanda, Shinagawa Ward, Tokyo. Its real owner was an elderly woman who had continued living there after the inn closed and had consistently refused to sell despite years of approaches from developers — exactly the kind of owner a buyer's team could not simply call up to confirm the deal. A fraud ring recruited a woman to pose as her, backed by forged identification, and signed a sale contract with Sekisui House for roughly ¥7 billion. Sekisui House paid out before the fraud was discovered, reporting a loss of about ¥5.5 billion. The ring's leader was later sentenced to prison, and in November 2024 the Tokyo District Court ordered several of those involved to pay Sekisui House ¥1 billion in damages. The case is also what Tokyo Swindlers is based on, which is largely why the term jimenshi is now widely recognized in Japan.

The safeguards already built into the registration system

Japan's registration system already assumes sellers can be impersonated and builds in checks for it. When someone registers a right to real property — buying it, for example — the Legal Affairs Bureau issues them 登記識別情報 (registration identification information): a 12-digit code, functioning like a password, that only the true registered right-holder should possess. To transfer or otherwise deal with that right later, the current registration must normally be filed together with that code, under Articles 21–22 of the Real Property Registration Act (不動産登記法).

If the code cannot be produced — lost, never received, or invalidated — the applicant cannot simply proceed on their word. Under Article 23 of the Act, the registrar must instead send a prior notice (事前通知) to the registered owner's address of record, and the registration goes through only if that owner confirms it within a set period: two weeks if the registered address is in Japan, four weeks if it is overseas, under Article 70, paragraph 8 of the Real Property Registration Rules (不動産登記規則). As an alternative to waiting on the prior notice, Article 23, paragraph 4 lets the registrar skip it if either a judicial scrivener or other qualified professional acting for the applicant personally confirms the applicant's identity and reports it as 本人確認情報 (identity confirmation information), or a notary public certifies that the applicant is who they claim to be.

None of this makes fraud impossible. In the Sekisui House case, the impersonator used a forged passport to obtain a genuine notarization — the notary's certificate itself was authentic, but the identity behind it was not. That is the core difficulty with jimenshi fraud: several of the individual documents a buyer or scrivener checks can each be real, issued by a real office, while the person presenting them is still not who they claim to be. That is why professionals are trained to cross-check several independent facts at once — matching name and address against the registration record exactly, verifying a photo ID against the actual person in front of them, checking that a seal certificate or residence certificate is not suspiciously old, and asking questions only the true owner would know, such as the amount they actually pay in fixed asset tax — rather than treating any single document as proof by itself.

不正登記防止申出: a preventive filing for owners

Separately from what a buyer checks, an owner who suspects their own registration identification information, seal, or seal certificate has been stolen or exposed can file 不正登記防止申出 (a fraud-prevention notification) with the Legal Affairs Bureau. For three months after filing, if anyone applies to register a change against that property, the Bureau notifies the person who filed the request and applies heightened scrutiny to the applicant's identity before proceeding. The filing must be made in person at the Legal Affairs Bureau — by the registered owner, an heir or other general successor, or their representative — and cannot be submitted by mail. This is most relevant to owners of vacant or unmanaged property, including Japanese nationals overseas whose inherited property has sat unregistered or unvisited for years; see How To Check Inherited Property In Japan From Overseas and How To Check If A Japanese Property Has Unregistered Inheritance if that describes your situation.

A practical order to work through this, whether you are a buyer, an agent, or the professional running the closing:

1. Order your own copy of the registration record — don't rely solely on a copy the seller or agent hands you. A document you request directly from Japan Property Research reflects the registry's actual, current state; a paper copy someone else gives you could be outdated, altered, or unrelated to the property in question.
2. Match the seller's name and address exactly against 甲区 (the ownership section). Check the kanji, not just the reading, and confirm the address on the seller's ID lines up with the registered address — or that any difference is explained by a change-of-address registration you can also verify. See How To Check Property Ownership In Japan for how to read that section.
3. Insist on meeting the seller in person, not only through an intermediary. A seller who is only ever reachable through an agent, or who avoids video calls and in-person meetings entirely, is a pattern worth treating as a serious flag rather than a convenience.
4. Check that identity documents are originals, current, and internally consistent. A seal certificate or certificate of residence issued long before the transaction, or a driver's license and passport with photos that don't obviously match the person in front of you, both warrant a harder look before you continue.
5. Ask something only the real owner would know. Professionals commonly confirm details like the property's actual fixed asset tax payment history or specific physical characteristics of the property — details a genuine owner answers naturally and an impersonator often cannot.
6. Treat unusual urgency or a below-market cash-fast sale as a reason to slow down, not speed up. A seller pushing hard to close quickly, especially on vacant land or a long-unoccupied building, is one of the patterns professionals flag most consistently in jimenshi cases.
7. Use a licensed judicial scrivener (司法書士) for the closing, and ask directly how they are confirming the seller's identity. A scrivener comfortable explaining whether they are relying on 事前通知, their own 本人確認情報 report, or a notary's certification — and why — is doing the job properly; one who brushes off the question is not.
8. If you own vacant or unmanaged property yourself, especially from overseas, consider whether 不正登記防止申出 is worth filing. It requires an in-person visit to a Legal Affairs Bureau, which is a real constraint for an owner living abroad, but it is the direct preventive tool available if you suspect your identification documents have been compromised.

What the registration record can and cannot tell you here:

• What it shows reliably: the name and address currently on file for the registered owner, in 甲区 — the baseline you check a seller's presented identity against — along with any other rights registered against the property, such as a mortgage or an existing provisional registration that would be worth asking about.
• What it does not show: whether the person you are dealing with is actually the individual named in 甲区. That is a due-diligence and identity-verification question, handled through the checks above and ultimately through the judicial scrivener's own confirmation process — the registry tells you who the owner is supposed to be, not who is standing in front of you.
• How to order it: on Japan Property Research, locate the property and order the land registration record for ¥1,500; if the property includes a house, order the building record as well, since they are registered separately. The Ownership Matters extract (+¥500 per record type, included on Pro and Team plans) shows just the current owner's name and address, which is often enough for a quick first cross-check against a seller's ID before you commit to the full due-diligence process.

Verifying a seller's identity is not a substitute for using a licensed judicial scrivener at closing, and it is not a checklist you should expect to run alone on a large or unusual transaction — it is a way to know what to ask, and to recognize the pattern early if something is off. Our Japan property due diligence checklist covers where this fits alongside ownership, mortgages, and boundary checks.

FAQ

What does jimenshi (地面師) actually mean? Jimenshi refers to organized fraud groups who impersonate a property's registered owner — backed by forged identity documents — to sell land or a building they do not own to an unsuspecting buyer.

Should I worry about this buying an ordinary condo from a normal seller I've met? Not particularly. Jimenshi fraud concentrates on properties where the real owner is hard to reach or verify directly — vacant land, long-unoccupied buildings, or property with an elderly, overseas, or deceased owner whose inheritance was never registered. An ordinary transaction with a seller you can meet and whose details check out against the registration record carries far less exposure.

What's the single most useful thing I can do to protect myself? Order the registration record yourself and match the seller's exact name and address against 甲区, rather than relying only on documents someone else shows you — combined with insisting on an in-person meeting and using a licensed judicial scrivener for the closing.

Does the 事前通知 (prior notice) system fully protect buyers? It protects against someone registering a change without the true owner's knowledge when the registration identification information is missing, by requiring the registered owner to confirm the application within two weeks (four if their registered address is overseas). It does not, by itself, protect against a scheme where the impersonator convinces a notary or scrivener that they are the true owner using forged documents — which is why professionals stack multiple independent checks rather than relying on any single safeguard.

I'm a Japanese national living overseas with inherited property back home — am I a more likely target? Property that sits vacant, unmanaged, and unregistered under the heirs' names is a pattern jimenshi groups look for, so yes, it is worth taking seriously. Completing the mandatory inheritance registration and keeping your registered address current both reduce that exposure — see How To Check Inherited Property In Japan From Overseas and How To Update Your Registered Address On A Japanese Property.

Can a judicial scrivener guarantee there's no fraud? No individual professional can guarantee it — forged documents can occasionally fool even careful, licensed professionals, as happened in the Sekisui House case. What a licensed scrivener adds is a formal identity-confirmation process backed by professional and legal accountability, which is a meaningfully stronger safeguard than proceeding without one, not an absolute guarantee.

Related guides:

• How To Read A Japanese Property Registration Record
• How To Check Property Ownership In Japan
• How To Check Inherited Property In Japan From Overseas
• How To Check If A Japanese Property Has Unregistered Inheritance
• How To Update Your Registered Address On A Japanese Property
• Japan Property Due Diligence Checklist
• How To Order A Japan Property Registration Record In English

• Real Property Registration Act (不動産登記法), Articles 21–23 — registration identification information, its use, and the prior notice procedure — e-Gov Japanese Law Search
• Real Property Registration Rules (不動産登記規則), Article 70 — the two-week/four-week prior notice response period — e-Gov Japanese Law Search
• 法務省：新不動産登記法Ｑ＆Ａ — background on registration identification information replacing the old paper certificate of registered matters — Ministry of Justice
• 法務局：登記識別情報を紛失したのですが、どうしたらよいのですか — official guidance on a lost registration identification information code and the fraud-prevention notification system — Legal Affairs Bureau, Ministry of Justice
• 'Tokyo Swindlers' ordered to pay Sekisui House ¥1 billion in damages over land fraud — The Tokyo Reporter
• Real-life 'Tokyo Swindlers' ordered to pay ¥1 billion in damages — The Japan Times
• 地面師が暗躍する時代の防衛手段 - 本人確認とは、所有権の有無を確認すること — All Japan Real Estate Association, Saitama Chapter

A note on scope: the amounts reported for the Sekisui House case vary somewhat between the contract price (around ¥7 billion) and the loss Sekisui House reported before the fraud was discovered (about ¥5.5 billion); this guide uses the figure most consistently cited in English-language reporting. The specific administrative sequence behind 事前通知 and the fraud-prevention notification are drawn from consistent professional and Ministry guidance rather than a single government page spelling out every step, so confirm the current procedure with a Legal Affairs Bureau or your judicial scrivener before relying on it for an actual transaction. Identity verification for a specific, high-value, or unusual transaction is ultimately a judgment call for a licensed judicial scrivener, not something this guide can substitute for.