Patent ID: 8142672

Claim:
An opto-electric hybrid board manufacturing method comprising the steps of: preparing an electric circuit board; fabricating an optical waveguide by forming an optical waveguide formation photosensitive resin layer on a surface opposite from a circuit formation surface of the electric circuit board and patterning a core formation region of the photosensitive resin layer by a photolithography method to form a core having a predetermined pattern; mounting an optical element on a part of the circuit formation surface of the electric circuit board in association with an end of the optical waveguide; forming a reflection portion on an end portion of the core located at the end of the optical waveguide, the reflection portion serving to reflect a light beam to permit light transmission between the core and the optical element; and forming a passage in the electric circuit board for the light transmission between the core and the optical element; wherein a photosensitive resin layer including an alignment mark formation region in addition to the core formation region is used as the photosensitive resin layer, and the alignment mark formation region is patterned by the photolithography method to form an alignment mark having a predetermined pattern simultaneously with the formation of the core in the optical waveguide fabricating step; wherein the optical element is mounted at a predetermined position with reference to the alignment mark in the optical element mounting step.