Patent ID: 8522427

Claim:
A method of manufacturing a printed circuit board, comprising the steps of: forming a conductive layer having a prescribed pattern on one or both major surfaces of a first insulating layer, the conductive layer including a metal plating layer formed on a thin metal film layer; roughening the major surface of said first insulating layer having said conductive layer thereon after the step of forming the conductive layer having the prescribed pattern, said roughening taking place only in a region of the major surface of said first insulating layer where the conductive layer is not present, a surface roughness of the roughened region of the major surface of the first insulating layer being at least 0.1 μm; and forming a second insulating layer on the one or both major surfaces of said first insulating layer such that said second insulating layer covers said conductive layer and comes into contact with the roughened region of the major surface of said first insulating layer.