Patent ID: 7078269

Claim:
A method of fabricating a substrate having a via terminal from a source substrate by piercing a conductive part through a core substrate of the substrate, the method comprising the steps of: forming a concave part on a front surface of a source substrate thicker than the core substrate; forming a front surface side conductive part by filling the concave part in the front surface with a conductor; forming the core substrate by grinding the source substrate from a rear surface of the source substrate up to a position immediately before the front surface side conductive part is exposed such that a tip of the front surface side conductive part is covered with a portion of the core substrate; exposing the tip of the front surface side conductive part by forming a concave part in a rear surface of the core substrate; forming a rear surface side conductive part by filling the concave part in the rear surface with a conductor; and electrically and mechanically connecting the front surface side conductive part with the rear surface side conductive part to form the via terminal.