Patent ID: 8633400

Claim:
A multilayer printed wiring board comprising: a first interlayer resin insulation layer; a first conductive circuit formed on the first interlayer resin insulation layer; a second interlayer resin insulation layer formed on the first interlayer resin insulation layer and the first conductive circuit; a second conductive circuit formed on the second interlayer resin insulation layer; a via conductor formed in the second interlayer resin insulation layer and connecting the first conductive circuit and the second conductive circuit; and a coating layer comprising at least one metal layer and a coating film and formed between the first conductive circuit and the second interlayer resin insulation layer, the metal layer being formed on a surface of the first conductive circuit and the coating film being formed on the metal layer, wherein the second interlayer resin insulation layer and the coating layer has an opening portion penetrating through the second interlayer resin insulation layer and the coating layer such that the opening portion forms an exposed portion of the first conductive circuit, and the via conductor is formed in the opening portion through the second interlayer resin insulation layer and the coating layer such that the via conductor has a bottom portion which is entirely positioned on the exposed portion of the first conductive circuit and which is directly connected to the exposed portion of the first conductive circuit.