Juminhyo and Inkan: The Two Documents Every Car Buyer in Japan Needs
Two pieces of paper, both available at your local ward office on the same day, and between them they unlock every car purchase in Japan. Here's exactly what you need and how to get it without making the mistakes most foreigners make.
8 min read · Category: paperwork
Back to Guides | Paperwork · 8 min read · Updated August 2026
Juminhyo and Inkan: The Two Documents Every Car Buyer in Japan Needs
Two pieces of paper and a stamp you can't buy at Daiso. Here's what a juminhyo actually proves, why your inkan matters more than your signature, and how to get both without wasting a trip to the ward office.
By Tre Mckee · Sapporo
If you're buying a car in Japan as a foreigner, you'll hear juminhyo and inkan early. They're real — and they're not identical for every car.
Everyone needs a path to a fresh jūminhyō for registration and a physical inkan (plus a clear photo of it for your agent or dealer file). Ordinary cars also need the City Hall inkan registration certificate (inkan tōroku shōmeisho / 印鑑登録証明書) (inkan registration certificate) in the registration pack. Kei cars, in the workflow we run, do not treat that certificate as a kei registration staple — you still want the seal and the photo.
Parking paper is separate: shako walkthrough. Full matrix: document checklist.
This guide covers what jūminhyō and inkan actually are, how to get them, the three-month validity trap, and the mistakes I keep seeing.
What is a jūminhyō, and why does a car dealer need to see it?
A juminhyo (住民票) is your official residence certificate. It's a single sheet of paper issued by the municipal office where you're registered as a resident, and it lists your name, your address, your date of birth, your nationality, and — critically for the car registration process — your household composition.
The dealer needs your juminhyo for two reasons. The first is identity verification: your juminhyo proves that you are legally resident at the address on your residence card, and that your name on both documents matches exactly. The second is procedural: when the dealer submits your car registration application to the Land Transport Bureau, the juminhyo is one of the core proof-of-residence documents the bureau requires. No juminhyo, no registration.
I've seen buyers assume their residence card alone would be enough. It isn't. The residence card shows your visa status and identity. The juminhyo shows your registered address in the municipal system. They serve different functions, and the registration office wants both.
One thing to be aware of: if you're married and your spouse is listed on your juminhyo as part of the same household, their name will appear on the certificate. If you're also listing them as a co-owner on the car, this is useful. If you aren't, and you'd rather not show their information to the dealer, you can request a juminhyo that shows only your own entry — just ask for "hon'nin dake" (本人だけ, "only the applicant") when you fill out the request form.
How do I get a jūminhyō, and what does it cost?
You go to the ward office or city hall for the municipality where your residence is registered — the same office where you did your initial address registration when you arrived. Walk in, grab the residence certificate request form (jūminhyō no utsushi kōfu shinseisho / 住民票の写し交付申請書), fill in your name, address, and date of birth, and hand it to the counter with ¥300. They'll print the certificate on the spot. The whole thing takes about 10 minutes if there's no line.
The fee varies slightly by municipality — some charge ¥200, most charge ¥300. None charge more than ¥300 for a basic copy. You don't need to bring your residence card as ID because the counter staff will verify your identity against the municipal system using the information on the form, but you should bring it anyway. It's faster if they can visually match you to the photo.
You can also get a juminhyo from a konbini (convenience store) if you have a My Number card with the digital certificate activated. Insert the card, enter your PIN, select "juminhyo," pay the fee, and the machine prints it. If you're comfortable with the My Number system and have the card set up, this is the fastest route — no counter, no form. Most foreigners I work with don't have their My Number card set up for konbini printing, so the ward office counter is the default path.
What's the 3-month rule, and why does it catch people out?
A juminhyo is only valid for car registration purposes if it was issued within the last three months. The Land Transport Bureau won't accept a certificate that's older than that, and most dealers won't either.
This is where the timing trap lives. The typical car-buying timeline runs four to eight weeks from first dealer visit to registration day, and if you ran to the ward office the moment you started looking — which feels like the responsible thing to do — your juminhyo could easily be expired by the time the registration paperwork actually goes in. You'd be standing at the finish line with a document the transport office won't touch.
The fix is simple but easy to miss: get the juminhyo as late in the process as possible. The right time is when the dealer tells you they need it, which is usually when the purchase contract is being drafted and the registration paperwork is about to be assembled. That's the window. If the dealer asks for it earlier — say, to verify your address before a test drive — that's a separate use and doesn't count toward the registration clock. Ask them to clarify which use they need it for, and whether you'll need a fresh one later.
The 3-month clock also applies to the inkan-shomeisho, which we'll get to in a moment. Get both at the same time, right before registration, and you won't have to make a second trip.
What is an inkan, and how is it different from a signature?
An inkan (印鑑) is a personal seal — a small cylindrical stamp, usually made of wood, horn, or resin, with your surname carved into the face. Instead of signing documents by hand, you stamp them with your inkan. Legally, in Japan, that stamp carries the same weight as a handwritten signature in most Western countries.
There are two kinds of inkan you'll encounter, and the distinction matters for buying a car. The first is a mitome-in (認め印), sometimes called a "recognized seal" or "casual seal." This is the everyday stamp — the one you use for receiving packages, signing in at the doctor's office, or acknowledging an internal memo at work. You can buy one for ¥1,000 to ¥3,000 at any hanko shop, Don Quijote, or online. No registration required. It's essentially a convenience item.
The second is a jitsu-in (実印), or "registered seal." This is the serious one. A jitsu-in is registered with your municipal office, linked to your name in the government database, and backed by a certificate (inkan-shomeisho) that proves the stamp is yours. This is the one you need for contracts with legal weight — buying real estate, opening a business bank account, and, yes, registering a car in your name.
A car dealer will ask for a jitsu-in, not a mitome-in. If you show up with a ¥1,000 stamp from Don Quijote, they'll politely tell you it won't work for the registration paperwork.
Mitome-in vs. jitsu-in — do I actually need both?
For buying a car, you only need one inkan: a registered jitsu-in. But practically speaking, most people end up with both.
The reason is that a jitsu-in is legally binding. Every time you stamp it on something, you're creating a contract. That's fine for the car purchase — that's exactly what it's for. But you don't want to carry your jitsu-in around and use it for receiving mail or signing into a gym, because that's like signing a blank cheque every time you acknowledge a delivery. So most people buy a cheap mitome-in for everyday use and keep the jitsu-in at home for the things that actually matter.
Here's a practical breakdown:
| Mitome-in (認め印) | Jitsu-in (実印) | |
|---|---|---|
| Purpose | Daily convenience — packages, office, low-stakes forms | Legal contracts — car purchase, real estate, business registration |
| Registration | None required | Registered at ward/city office |
| Cost | ¥1,000–3,000 | ¥3,000–10,000 |
| Certificate (inkan-shomeisho) | Not available — no registration means no certificate | Available — proves the stamp is yours |
| Where to buy | Don Quijote, hanko shop, Amazon, online | Hanko shop (order in person), online with registration details |
| Do you need it for a car? | No | Yes |
If you already have a jitsu-in — maybe from when you opened a bank account or bought property — you can use the same one for the car registration. You don't need a separate inkan for each purpose. One jitsu-in covers everything.
How do I register an inkan, and why does car registration require it?
Inkan registration (inkan tōroku / 印鑑登録) costs ¥50 at your ward or city office. You bring your jitsu-in, your residence card, and the ¥50 fee to the resident registration counter. They'll verify your identity, stamp the inkan into their system, and issue you an inkan registration card (印鑑登録証) — usually a small laminated card that looks like a library card. Keep this card. You'll need it every time you request an inkan-shomeisho.
The whole process takes about 15 minutes. You can do it the same day, right after picking up your juminhyo. Again, same building, same counter area.
Why does car registration require a registered inkan? Because when you stamp the registration application, the Land Transport Bureau needs to know that the stamp actually belongs to you. The registered inkan, combined with the inkan-shomeisho (the certificate that proves the registration), creates a chain of trust: the certificate says "this stamp belongs to this person," the stamp is on the registration form, and the name on both documents matches. Without registration, the stamp is just a piece of carved wood with no legal identity attached.
I've had clients push back on this: "I have a signature, why isn't that enough?" It's a fair question. The short answer is that Japan's legal system runs on seals, not signatures, and has for centuries. The car registration system isn't going to change for you. The longer answer is that the inkan registration system actually provides stronger identity verification than most signature-based systems — the physical stamp is harder to forge than a signature, and the registration ties it to a specific person in a government database that the transport office can verify.
What is an inkan-shomeisho, and when do I need one?
An inkan-shomeisho (印鑑証明書) is the certificate that proves your registered inkan is yours. Think of it as the birth certificate for your inkan. It's a single sheet issued by your municipal office, and it certifies that the inkan used to stamp a given document matches the inkan registered under your name in the municipal database.
The process: you go to the ward or city office with your inkan registration card, fill out a request form, pay ¥200–300, and they print the certificate. Same day, same counter. You can also get one from a konbini if your My Number card is set up for it.
For car registration, you'll typically need to stamp the purchase contract and the registration application with your jitsu-in, then include an inkan-shomeisho so the transport office can verify the stamp is legitimate. Your dealer will tell you exactly which documents need the stamp and how many certificate copies to bring. One copy is usually enough.
Like the juminhyo, the inkan-shomeisho has a 3-month validity window for registration purposes. Get it at the same time as your juminhyo — right before the registration paperwork goes in — and both will be valid through the entire process.
Here's the complete timeline for one efficient ward office trip:
- Go to the counter with your residence card, your jitsu-in, and about ¥650 in cash.
- Request a juminhyo (¥300). Collect it.
- If you haven't registered your inkan yet, do it now (¥50). Get the registration card.
- Request an inkan-shomeisho (¥200–300). You'll need your registration card for this.
- Walk out with all three items. Total time: 20 to 30 minutes.
Do this when the dealer is assembling the registration packet — not when you first start browsing GooNet.
The most common mistakes foreigners make with these two documents
I've watched a lot of people trip over the same things. Here are the ones that come up most often, in roughly descending order of how expensive they are to fix.
Getting the juminhyo too early. This is the number one mistake, and I've already covered it, but it bears repeating because it feels so counterintuitive. You're being responsible. You're getting your paperwork in order. And you're setting yourself up to do it all again in six weeks because the certificate expired. Wait until the dealer asks.
Buying a mitome-in and assuming it'll work for registration. The ¥1,000 stamp from Don Quijote is not a jitsu-in, no matter how nice it looks. The dealer needs a registered seal backed by an inkan-shomeisho. If you bring a mitome-in, you'll be sent to a hanko shop to order a proper jitsu-in, and then to the ward office to register it. That adds three to seven days to your timeline.
Getting the name wrong on the inkan. This one is subtle and it causes genuine problems. Your inkan needs to match the name on your juminhyo exactly. For most foreigners, that means your name in katakana as it appears on your residence card. If your residence card shows the katakana name Sumisu Jon (スミス ジョン — Smith John, family name first), that's what your inkan should read. If you have an inkan carved with your name in romaji (English characters
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