Photoelectric coupling assembly and method of coupling optical fibers and light receiving/emitting elements

A photoelectric coupling assembly that is not affected by heat or adhesive leakage when mounted on a substrate, and a method of coupling an optical fiber and a light receiving/emitting element. The photoelectric coupling assembly includes (1) an optical fiber; (2) a plug having a through-hole into which the optical fiber is held in a manner where a distal end of the optical fiber protrudes from the plug; and (3) an optical head member including a photoelectric conversion unit having a light receiving/emitting element including a light receiving/emitting unit, and an aligning member having a guide hole to guide the distal end of the optical fiber to the light receiving/emitting unit when the plug and the optical head are detachably fitted into each other.