Patent ID: 8499446

Claim:
A method of manufacturing a multilayer printed wiring board, comprising: forming a first interlaminar resin insulating layer; forming a first conductor circuit on the first interlaminar resin insulating layer; forming a second interlaminar resin insulating layer on the first conductor circuit and the first interlaminar resin insulating layer; forming an opening portion in the second interlaminar resin insulating layer to expose a face of the first conductor circuit; forming an electroless plating film on a surface of the second interlaminar resin insulating layer and the exposed face of the first conductor circuit; forming a plating resist on a portion of the electroless plating film; substituting the electroless plating film formed on the exposed face and the second interlaminar resin, on which the plating resist is not formed, with a thin film conductor layer, the thin film conductor layer having a lower ion tendency than the electroless plating film and including a metal of the exposed face of the first conductor circuit; forming an electroplating film including the metal on the thin film conductor layer; stripping the plating resist, and removing the electroless plating film exposed by the stripping of the plating resist.