Patent ID: 8829361

Claim:
A wiring board comprising: a plurality of resin layers including a first resin layer disposed as an uppermost layer and a second resin layer adjacent to the first resin layer; a plurality of pads arranged in a substantially matrix form on the first resin layer; a plurality of first via-conductors having upper ends electrically connected to lower surfaces of the plurality of pads, respectively and penetrating the first resin layer in a thickness direction; a plurality of first wiring conductors having upper surfaces electrically connected to lower ends of the plurality of first via-conductors, respectively and being disposed between the first resin layer and the second resin layer; a plurality of second via-conductors having upper ends electrically connected to lower surfaces of the first wiring conductors, respectively and penetrating the second resin layer in a thickness direction; a plurality of second wiring conductors having upper surfaces electrically connected to lower ends of the plurality of second via-conductors, respectively; wherein the wiring board includes: a rectangular mount region surrounded by four sides which are circumscribed to pads located in an outer peripheral area among the plurality of pads arranged in the substantially matrix form; a corner pad close to a corner of the mount region; and a second corner via-conductor electrically connected to the corner pad via the first via-conductor and the first wiring conductor, wherein a distance in a plane direction between the second corner via-conductor and a center of the mount region is smaller than a distance in the plane direction between the corner pad and the center of the mount region.