Patent ID: 7375289

Claim:
A multi-layer printed wiring board comprising: a core board; a plurality of first conductive circuits formed on the core board; an interlayer insulating resin layer comprising a fiber and having a plurality of via holes, the interlayer insulating resin layer formed on the core board and the first conductive circuits; a plurality of second conductive circuits formed on the interlayer insulating resin layer and comprising a metal film formed on the interlayer insulating resin layer, the metal film having a plurality of openings for forming the plurality of via holes through the interlayer insulating resin layer, an electroless plate film formed on the metal film and an electrolytic film formed on the electroless plate film; via contacts formed in the via holes and connecting the first conductive circuits and the second conductive circuits; and a plurality of alignment marks formed on the interlayer insulating resin layer and configured to serve as an index for a position of the via holes, each of the alignment marks comprising a metal material which is same as the metal film and is formed in an opening in the metal film, wherein the metal film and the alignment marks are formed on a same side of the interlayer insulating resin lager.