Patent ID: 8365402

Claim:
A method for manufacturing a printed wiring board, comprising: forming a substrate by: preparing an insulative resin base material having a first surface and a second surface opposite to the first surface, and preparing a transfer laminate having an insulative resin layer with a conductive foil, a removal layer and a transfer base sequentially laminated on each of opposing surfaces of the insulative resin layer; forming a respective conductive circuit on each transfer base of the transfer laminate; removing each transfer base from the transfer laminate; and embedding respective conductive circuits in the first surface and in the second surface of the insulative resin base material by pressing each transfer base onto a respective one of the first and second surfaces of the insulative resin base material in such a way that the conductive circuit on each transfer base is embedded in the insulative resin base material; forming a via opening that reaches from the first surface to the conductive circuit embedded in the second surface, or that reaches from the second surface to the conductive circuit embedded in the first surface; forming an electroless plated film on an inner wall of the via opening by performing electroless plating on the substrate; and forming a filled via by performing electrolytic plating on the substrate and filling metal in the via opening having the electroless plated film formed on the inner wall.