Patent ID: 8188380

Claim:
A printed wiring board, comprising: a resin insulation layer having a first surface and a second surface on an opposite side of the first surface; a first conductive circuit formed on the second surface of the resin insulation layer; an electronic-component mounting pad structure comprising an embedded portion embedded in the resin insulation layer and a protruding portion protruding from the first surface of the resin insulation layer; and a first via conductor formed in the resin insulation layer and connecting the first conductive circuit on the second surface of the resin insulation layer and the embedded portion of the electronic-component mounting pad structure, wherein the protruding portion of the electronic-component mounting pad structure has a diameter which is larger than a diameter of the embedded portion of the electronic-component mounting pad structure, and the diameter of the embedded portion of the electronic-component mounting pad structure is larger than a surface of the first via conductor in contact with the embedded portion of the electronic-component mounting pad structure.