Opto-electric hybrid board and manufacturing method thereof

A method of manufacturing an opto-electric hybrid board, comprising the steps of:

• (a) producing an electric circuit portion;
• (b) producing an optical waveguide portion;
• (c) mounting an optical element on the electric circuit portion,
• said step (b) including the steps of
• (b-1) forming a translucent under cladding layer,
• (b-2) forming a linear core for an optical path and a first alignment mark on a surface of the under cladding layer and positioned relative to an end portion of the core, and
• (b-3) forming an over cladding layer on the surface of the under cladding layer so as to cover the core and the first alignment mark,
• said step (a) including the steps of
• (a-1) forming an electric circuit and a second alignment mark for positioning of the optical element on a substrate, and
• (a-2) covering a surface of the second alignment mark with a resin layer, except for an uncovered portion for identification, by using the first alignment mark as a reference,
• wherein the mounting of the optical element in said step (c) is achieved by using the uncovered portion for identification of the second alignment mark as a reference.