Patent ID: 8418360

Claim:
A method for manufacturing a printed wiring board, comprising: preparing a carrier; forming a metal layer on the carrier; forming an etching resist on the metal layer; forming a metal film from the metal layer underneath the etching resist by removing a portion of the metal layer exposed through the etching resist and part of the metal layer which is contiguous to the exposed portion of the metal layer and is formed underneath the etching resist; forming a coating layer on a side surface of the metal film and the carrier; forming, on the coating layer, a pad having a first surface and a second surface opposite the first surface; removing the etching resist; forming, on the metal film and the second surface of the pad, a resin insulation layer having a first surface and a second surface opposite the first surface; forming, in the resin insulation layer, a first opening reaching the second surface of the pad; forming a first conductive circuit on the second surface of the resin insulation layer; forming, in the first opening, a first via conductor connecting the first conductive circuit and the pad; removing the carrier from the metal film and the coating layer; and removing the metal film.