An investor from Japan setting up a representative office — how should the supporting documents be translated and certified?

This question is specifically about “An investor from Japan setting up a representative office”, so it deals with the case-specific points first and the shared rules afterwards. The terms that frame this page are investor · Japan · setting · representative. The specifics here are destination: Jp, and those decide which translation and certification level applies. Before starting, make sure document numbers, issue dates and issuing-office names match across the set, then keep a digital copy of every page, including seals and signatures, then plan the timeline so certification finishes before the real filing deadline. What changes the timeline most here is whether the source documents are complete on day one. The common failure in this group of cases is a translation that does not match the certification type required. Record the reference number of each certification layer; it is the fastest way to trace status. High-resolution photos of seals and signatures help when the destination asks for re-verification. When several certification layers are required, start with the slowest one. If multiple certified sets are needed, order them all in the first round to avoid re-queuing. The next step is confirming the filing channel and the copy or file format required. Foreign documents used in a work permit or incorporation file — degrees, experience letters, the parent company's certificate of incorporation, powers of attorney and passports — must be translated into Thai or English as the office requires and certified along the correct chain: certification in the country of origin, then embassy or Department of Consular Affairs legalisation as applicable. Companies are registered with the Department of Business Development (DBD), Ministry of Commerce: a private limited company is formed under the Civil and Commercial Code and a public limited company under the Public Limited Companies Act B.E. 2535 (1992), with a memorandum of association, articles and a shareholder list among the incorporation papers. Thailand deposited its instrument of accession to the Apostille Convention on 30 June 2026, but the Convention is not yet in force for Thailand, so embassy and Department of Consular Affairs legalisation remains the working route. Cost and lead time depend on page count, language pair and the certification steps the receiving authority requires, so every file is quoted before work starts. Send the checklist you were given, the applicant's nationality and the office you will file with via LINE @NAATI, call +66 80-557-8887 or email ilc@thainotary.co.th.

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