Patent ID: 8836361

Claim:
A wiring board comprising: a core substrate; and a buildup layer formed on the core substrate, wherein the buildup layer includes: a plurality of resin layers laminated on the core substrate; a plurality of pads formed on a topmost layer of the resin layers and to which a plurality of probes are respectively connected; a plurality of wiring conductors formed on either the resin layers or the core substrate and electrically connecting the plurality of pads individually to an external circuit; a via conductor penetrating through the resin layer in a thickness direction thereof and electrically connecting the pad and the wiring conductor together; and a dummy via conductor penetrating through the resin layer in the thickness direction thereof without electrically connecting the pad and the wiring conductor together, wherein the via conductor and the dummy via conductor are arranged immediately below each of the pads, the pads include a first pad with at least one of the dummy via conductors arranged immediately therebelow, and a second pad with only the via conductor arranged immediately therebelow, and wherein a total amount of the dummy via conductors and a quantity of the via conductors formed immediately below the first pad is equal to an amount of the via conductors formed immediately below the second pad.