Overview
Process Server in Japan: How Service of Process Works
Japan has been a Hague Service Convention signatory since 1970, with the Ministry of Foreign Affairs (MOFA) designated as its Central Authority. For decades, direct postal service was commonly used, but on December 21, 2018, Japan formally objected to Article 10(a), closing that route. Since then, valid service into Japan requires a request through MOFA, which refers the matter to the competent Japanese court for service by a court marshal or Japan's own internal special postal service. Every document must be fully translated into Japanese; both MOFA's Consular Affairs Bureau and the Civil Affairs Bureau of the Supreme Court of Japan review the translation page by page, and any gap results in rejection.
In Japan, how you serve decides whether a U.S. judgment can ever be collected there. A foreign judgment is enforced only through a Japanese execution judgment under Article 24 of the Civil Execution Act, and the Japanese court first checks the four conditions in Article 118 of the Code of Civil Procedure.
Those conditions are: the foreign court had jurisdiction; the defendant was properly served or appeared; the judgment and proceedings do not offend Japanese public order; and there is reciprocity with the foreign country. Japan's Supreme Court held in 1998 that service must comply with any applicable treaty to count, and Japanese courts have refused to recognize foreign judgments where papers were sent without a Japanese translation.
That is why careful plaintiffs use the Central Authority route, with full Japanese translations, whenever the defendant has assets in Japan. Japan's 2018 objection to postal service removed most remaining doubt, and the punitive part of a U.S. judgment may still be refused on public order grounds even after proper service.
Who serves process
Who Can Serve Legal Documents in Japan
In Japan, service is an official act of the courts. For requests from abroad, the Ministry of Foreign Affairs, Japan's Central Authority, sends the documents to the competent court, which serves them by special postal service under Article 49 of the Mail Act, with the postal worker preparing a report of service, or through a court marshal.
Japan objected to postal service under Article 10(a) on December 21, 2018, and it also opposes service under Article 10(b) and (c). Service through the Central Authority is therefore the reliable route. Japan requires a full Japanese translation of every document, and Japan's Supreme Court has held that improper service can block enforcement of a foreign judgment in Japan.
For defendants in Tokyo or elsewhere in Japan, the usual starting point is a statement of claim with a summons to appear; orders, notices and enforcement papers follow later in a case. Defendants may be anywhere from Tokyo to Kyushu & Okinawa, and we cover the whole country.
Proof you receive: certificate or sworn affidavit
The Japanese court that carried out service sends back the Hague Certificate of Service, together with a bill for any costs to be reimbursed.
MOFA Central Authority Submission
We prepare and transmit the Hague request to Japan's Ministry of Foreign Affairs, which refers it to the competent Japanese court for service by marshal or Japan's internal postal service — the only valid route since Japan's 2018 objection to Article 10(a).
Full Japanese Translation & Page-Verification
MOFA and the Supreme Court's Civil Affairs Bureau check every page of a submitted translation before service proceeds. We prepare complete, verification-ready Japanese translations to avoid the rejections that incomplete filings routinely trigger.
Case Tracking to Certificate of Service
We track the request from MOFA referral through court-level execution to the final Article 6 certificate of service, keeping counsel informed at each stage of Japan's multi-agency review process.
The rules
Japan Service of Process Rules
The rules that govern service in Japan:
| Rule | What it covers |
|---|---|
| Mail Act Art. 49 | Special postal service with a report of service |
| Hague Art. 10 | Japan opposes 10(a) (since 2018), 10(b) and 10(c) |
| CCP Art. 118 | Four conditions for recognizing a foreign judgment |
| Civil Execution Act Art. 24 | Execution judgment needed to enforce a foreign judgment |
| Supreme Court, 28 Apr. 1998 | Service must comply with the applicable treaty |
Treaties
Hague Service Convention and Japan
Japan is a party to the Hague Service Convention, so documents can be sent to its Central Authority, which arranges service and returns a Certificate of Service. Japan has made a declaration on Article 10, which limits service by post or by private agents, so we confirm which methods are open before choosing one.
Japan is not a party to the Hague Evidence Convention, so requests for witness testimony or documents go through letters rogatory.
