Patent ID: 8334461

Claim:
A wiring board adapted for mounting an electronic component, comprising: a plurality of stacked wiring layers having an insulating layer interposed therebetween; a wiring forming region defined by a portion corresponding to a region where the electronic component is mounted; and a peripheral region around the wiring forming region, wherein, in the wiring forming region, the plurality of wiring layers are interconnected through a via hole formed in the insulating layer, and outermost wiring layers of the plurality of stacked wiring layers are provided on both surfaces of the wiring board, and wherein, in the peripheral region, a plurality of openings are formed in the insulating layer in a portion where a wiring of the wiring layer is not formed, with each opening being defined entirely by the insulating layer and being unfilled therein, and the plurality of openings extending from one outermost wiring layer to the other outermost wiring layer of the plurality of wiring layers of the wiring board in a thickness direction thereof.