Patent ID: 7589282

Claim:
A wiring board comprising: a core composite layer including a first core board, an optical transmission portion disposed on the first core board, and a second core board disposed on the optical transmission portion, wherein a first mounting region and a second mounting region are assigned on an upper surface of the second core board; a plurality of first electrodes disposed on the first mounting region, the first mounting region being adapted to mount an optical semiconductor module on the first electrodes, wherein the optical semiconductor module is optically connectable to the optical transmission portion through a gap between the first electrodes; upper core board wirings disposed on the second mounting region; upper build-up wirings stacked on the upper core board wirings, having second electrodes being adapted to mount semiconductor modules; lower core board wirings disposed beneath the first core board; lower build-up wirings disposed beneath the lower core board wirings; and a mirror disposed below the first electrodes and on the optical transmission portion, configured to form an optical path to the optical semiconductor module from the optical transmission portion.