Activities of representative office are service business under List (21) of the Foreign Business Act B.E. 2542 (1999). In the past, the definition of the representative office, in accordance with the Regulations of the Office of the Prime Minister governing application for Establishment of Representative Office of foreign juristic persons respecting international trading business B.E. 2529 (1986). Subsequent the mentioned regulations together wit Announcement No 281 of the National Executive Council were abolished. In the present, definition of representative office, in accordance with the regulations of the Office of the Prime Minister in Establishment of Work permit and Visa Center (No.3) B.E. 2544 (2001).