Patent ID: 8237270

Claim:
A wiring board comprising: an electrode pad having a cylindrical portion and a protruded portion having a flange portion, the cylindrical portion and the protruded portion integrally formed as one-piece from a metal common to the cylindrical portion and the protruded portion, the protruded portion having a width greater than that of the cylindrical portion, and the flange portion extending outwardly from an outer periphery of the cylindrical portion; and an insulating layer arranged to cover a surface of the electrode pad, wherein the protruded portion protrudes outwardly in a circumferential direction from an outer periphery of the cylindrical portion at a first end of the cylindrical portion, a first end of the protruded portion defining a first surface side of the electrode pad, the first surface side of the electrode pad being embedded in and surrounded by the insulating layer; wherein a side surface of the protruded portion and the outer periphery of the cylindrical portion are roughened.