Patent ID: 8176627

Claim:
A method of manufacturing a wiring substrate, comprising the steps of: obtaining a structure in which an underlying layer is arranged in a wiring forming area of a temporary substrate, and a peelable multi-layer metal foil that is larger in size than the underlying layer is arranged on the underlying layer and is adhered partially to an outer peripheral portion of the wiring forming area of the temporary substrate, the peelable multi-layer metal foil constructed by temporary adhering a first metal foil and a second metal foil with peelable adhesive layer; forming a built-up wiring layer on the peelable multi-layer metal foil; and separating the peelable multi-layer metal foil from the temporary substrate, by cutting a portion of a structure in which the underlying layer, the peelable multi-layer metal foil, and the built-up wiring layer are formed on the temporary substrate, the portion corresponding to a peripheral portion the underlying layer, to obtain a wiring member in which the built-up wiring layer is formed on the peelable multi-layer metal foil.