Patent ID: 8108993

Claim:
A method of manufacturing a wiring substrate, the method comprising: (a) preparing a supporting substrate comprising a main body and a through electrode penetrating the main body, wherein the supporting substrate comprises a first surface and a second surface opposite to the first surface, and a trace is formed on the second surface of the supporting substrate; (b) forming a protruded electrode on the first surface of the supporting substrate such that a forming position of the protruded electrode corresponds to a forming position of the through electrode; (c) forming a peeling promotion layer on the first surface of the supporting substrate such that a tip end of the protruded electrode is exposed from the peeling promotion layer; (d) forming a build-up wiring structure by alternately forming a wiring layer and an insulating layer on the first surface of the supporting substrate; and (e) obtaining a wiring substrate by separating the build-up wiring structure from the supporting substrate, wherein step (d) comprises: forming the wiring layer such that the wiring layer is electrically connected to the tip end of the protruded electrode, using the through electrode as a power feeding wiring, and wherein step (e) comprises: separating the peeling promotion layer and the protruded electrode from the build-up wiring structure to separate the build-up wiring structure from the supporting substrate.