Patent ID: 8020291

Claim:
A method of manufacturing a printed wiring board, comprising: forming a conductor circuit over a first resin insulation layer; forming a metal layer comprising Sn on a surface of the conductor circuit, wherein the metal layer is formed to have a flat surface; and forming a second resin insulation layer over the conductor circuit and the metal layer, wherein the forming of the conductor circuit comprises forming an electroless plated layer on the first resin insulation layer, forming a plating resist layer having an opening pattern corresponding to the conductor circuit on the electroless plated layer, forming an electroplated layer on a portion of the electroless plated layer exposed by the opening pattern of the plating resist layer, removing the plating resist layer, and removing a portion of the electroless plated layer exposed by the removing of plating resist layer such that the conductor circuit comprising the electroless plated layer and the electroplated layer is formed.