There is provided a method of manufacturing an optical module comprises a component fixing step in which an optical waveguide and at least one optical device are detachably held by a fixing member capable of holding an uncured light curable resin in a required position, and a core forming step in which light of a wavelength for curing the light curable resin is emitted from the leading end of the optical waveguide to the light curable resin uncured and thus the light curable resin is cured to form a shaftlike core. According thereto, the optical waveguide and the optical device are connected by the core.