PURPOSE: To obtain an optical connector plug of high performance and a low cost by disposing a plug having a cylindrical shape concentrically with a metal and a plastic material.

CONSTITUTION: The outside circumferential part of a plastic pipe body 7 which has a continuously formed small hole 2 slightly larger than the outside diameter of an optical fiber and a through-hole 3 of a larger diameter through a tapered part 4 on the central axis, and has a collar 5 and an air vent hole 6 in the central part is covered with a cylindrical collar 1 of metals, ceramics, rigid glass, etc., whereby the plug is constituted into double construction. The plug constituted in such a way prevents the abrasion of the fitting surface with the high accuracy of machining with metals and their strong mechanical properties and offers improved productivity and reduced costs with the ease of molding with plastics.