Patent ID: 8225502

Claim:
A method of manufacturing a wiring board comprising: a first step of forming a first insulating layer on a support substrate, said first insulating layer having a substrate facing surface and an outward facing surface opposite to the substrate facing surface, said substrate facing surface provided directly on a support substrate first surface; a second step of forming, in the first insulating layer, a tapered opening having a small diameter at the substrate facing surface and a large diameter at the outward facing surface, said tapered opening exposing a portion of the support substrate first surface; a third step of forming, on an inner part of the tapered opening and the portion of the support substrate first surface which is exposed by the tapered opening, a first electrode pad having a small diameter at a substrate facing end provided on the portion of the support substrate first surface which is exposed by the tapered opening, and a large diameter at an outward facing end opposite to the substrate facing end and adjacent to the outward facing surface of the first insulating layer, wherein the first electrode pad is formed such that the outward facing end of the first electrode pad defines a surface which is flush with the outward facing surface of the first insulating layer; a fourth step of forming, on the outward facing end of the first electrode pad and the outward facing surface of the first insulating layer, a second electrode pad to be electrically connected to the first electrode pad such that a diameter of the second electrode pad is larger than the large diameter of the first electrode pad when viewed from a top; a fifth step of forming a second insulating layer on the outward facing surface of the first insulating layer and the second electrode pad to cover the second electrode pad; and a sixth step of removing the support substrate and exposing the substrate facing end of the first electrode pad.