Patent ID: 8119932

Claim:
A wiring board including a core substrate and wiring layers stacked on at least one surface of the core substrate, the core substrate comprising: a first base material in the form of a flat silicon board, having a recessed portion formed in a desired pattern on one surface thereof; a second base material in the form of a flat silicon board, directly bonded to and laminated on the surface of the first base material on which the recessed portion is formed; an insulating layer formed on the surface of each silicon board; a through hole formed at a desired position in the laminated structure formed of the first and second base materials, in such a manner as to pierce the structure in a direction of thickness thereof and to communicate with the recessed portion; and a conductive material integrally filled into the through hole and the recessed portion with the insulating layer interposed between the silicon board and the conductive material.