Patent ID: 7582551

Claim:
A wiring substrate manufacturing method, comprising: a first step of forming, on a support plate, an electrode pad made of metal; a second step of etching the support plate in such a manner that the support plate has a shape including a projection portion to be contacted with the electrode pad and a tip end, which is in contact with the electrode pad, of the projection portion is smaller than a surface of the electrode pad at a side to be contacted with the projection portion; a third step of forming, on a surface of the support plate, an insulating layer for covering the electrode pad; a fourth step of forming, on a surface of the insulating layer, a conductive pattern to be connected to the electrode pad; and a fifth step of removing the support plate, wherein the electrode pad and support plate are made of different metal material and, in the second step, of the electrode pad and support plate, the support plate is selectively etched.