Patent ID: 6912779

Claim:
A method of manufacturing a flexible wiring board, with a substrate, wherein the flexible wiring board comprises a reference conductive layer; a first base film provided on said reference conductive layer; and a first surface conductive layer provided on said first base film, the method comprising: forming a first hole penetrating said first surface conductive layer and said first base film so that said reference conductive layer is exposed on its bottom and said first base film is exposed on an inner peripheral side face; depositing, by electroless plating, a first electroless plating layer on at least a surface of said first base film exposed on the inner peripheral side face of said first hole; growing, by electrolytic plating, a first electrolytic plating layer on a surface of said first electroless plating layer so as to fill said first hole with said first electrolytic plating layer; removing said first electrolytic plating layer and said first electroless plating layer provided on said first surface conductive layer so as to expose said first surface conductive layer; and depositing an auxiliary electrolytic plating layer by electrolytic plating on a surface of said reference conductive layer, exposed on the bottom of said first hole, prior to said step of depositing said first electroless plating layer.