Patent ID: 7747123

Claim:
A method of manufacturing an opto-electric hybrid board, comprising the steps of: forming a core-forming resin layer on an under cladding layer; forming a resist layer on the core-forming resin layer; forming the resist layer and the core-forming resin layer into a predetermined pattern by patterning to form the core-forming resin layer into cores; forming a thin metal film on the under cladding layer with the resist layer and the cores patterned so as to cover the resist layer and the cores; removing the resist layer covered with a portion of the thin metal film together with the portion of the thin metal film; electroplating the remaining portion of the thin metal film lying on side surfaces of the cores patterned to protrude and lying on a portion of the under cladding layer between the cores to fill grooves defined between adjacent ones of the cores with plated layers, thereby causing the plated layers to serve as electrical interconnect lines; and forming an over cladding layer so as to cover the cores and the electrical interconnect lines.