Patent ID: 8085546

Claim:
A coreless multilayer printed wiring board comprising: an outermost coreless layer having an opening; a conductive film formed on a surface of the outermost coreless layer and closing one end of the opening of the outermost coreless layer; a via-hole structure formed in the opening of the outermost coreless layer; a first resin layer formed on the surface of the outermost coreless layer and the conductive film and having an opening reaching to the conductive film; a first via-hole structure formed in the opening of the first resin layer; a second resin layer formed on a surface of the first resin layer and having an opening; and a second via-hole structure formed in the opening of the second resin layer, wherein the outermost coreless layer is an outermost resin layer of the coreless multilayer printed wiring board, the first and second via-hole structures formed in the first and second resin layers are tapered in a direction opposite to a direction in which the via-hole structure formed in the outermost coreless layer is tapered.