Patent ID: 7122746

Claim:
A multilayer wiring board assembly laminated with a plurality of multilayer wiring board assembly components, at least one of said multilayer wiring board assembly components comprising: a copper plated resin film made of a resin film having adhesivity which is provided with a copper foil bonded to one surface thereof and in which a through hole is opened through said copper foil and said resin film; and a conductive paste embedded in the through hole of said copper plated resin film so as to have a first projection of said conductive paste projected from said resin film and a second projection of said conductive paste projected from said copper foil and said second projection of said conductive paste being laterally extending beyond the perimeter of the opening of the through hole of said copper foil, wherein said multilayer wiring board assembly is laminated with a plurality of said multilayer wiring board assembly components through said resin film in order that the first projection of said conductive paste of said at least one of said multilayer wiring board assembly components makes electric contact with said copper foil or the second projection of said conductive paste of an adjacent one of said multilayer wiring board assembly components through a lateral brim portion of the first projection having a diameter larger than a diameter of said through hole, and wherein a separate paper is disposed in the outlet of said through hole near said resin film in advance of said step of embedding said conductive paste.