Patent ID: 8907489

Claim:
A wiring substrate comprising: a substrate, a material of the substrate consisting of glass or silicon, the substrate having a first surface and a second surface opposite to the first surface, the substrate being formed with a through hole whose diameter is gradually decreased from the first surface to the second surface; a connection pad formed on the second surface of the substrate; a first wiring layer formed in the through hole and electrically connected to the connection pad; a first insulation layer formed on the first surface of the substrate to cover the first wiring layer; and a second wiring layer formed on the first insulation layer and electrically connected to the first wiring layer; a plurality of insulation layers and a plurality of wiring layers being alternately arranged to form a stack on the first surface side of the substrate; and a solder resist layer formed on a surface of the stack opposite to the substrate, wherein the second surface of the substrate is a mounting surface on which a semiconductor chip is to be mounted, and the first insulation layer formed on the first surface of the substrate is made of a resin material.