Patent ID: 7772118

Claim:
A method of manufacturing a substrate, the substrate comprising a base member having a through-hole and a penetrating via formed in the through-hole in the base member, the penetrating via including a penetrating part provided in the through-hole and a first protrusion provided at an end of the penetrating part, the first protrusion protruding from the base member, the method comprising: disposing the substrate having the through-hole on a power supply layer via a first resist layer; removing a portion of the first resist layer exposed to the through-hole to expose the power supply layer and forming a space being wider than the through-hole in diameter; hardening the first resist layer according to a first thermal treatment after forming the space; and forming the penetrating via by filling the space and the through-hole with a conductive metal layer formed by means of power supplied by the power supply layer after the hardening.