Patent ID: 8027169

Claim:
A multilayer printed wiring board comprising: a lowermost insulating layer comprising a core layer and forming an outermost insulating layer having a via-hole structure; a conductive film formed on a surface of the lowermost insulating layer; a first via-hole structure comprising a plating material and formed through the lowermost insulating layer; a first resin layer formed over the surface of the lowermost insulating layer and the conductive film; a second via-hole structure comprising a plating material and formed through the first resin layer; a second resin layer formed on a surface of the first resin layer; and a third via-hole structure comprising a plating material and formed through the second resin layer, wherein the second via-hole structure through the first resin layer is tapered in a direction opposite to a direction in which the first via-hole structure through the lowermost insulating layer is tapered, the conductive film is sandwiched between the first via-hole structure and the second via hole structure, the first via-hole structure and the second via hole structure are in contact with the conductive film, and the third via-hole structure through the second resin layer is tapered in the direction opposite to the direction in which the first via-hole structure through the lowermost insulating layer is tapered.