Patent ID: 8379402

Claim:
A wiring board having a lead pin comprising: a connecting pad which is formed on the wiring board, and to which the lead pin is bonded through a conductive material, wherein the lead pin includes: a shaft portion; a head portion which is provided on one end of the shaft portion, said head portion having a diameter greater than that of the shaft portion; a protruded portion which is formed on a surface side of the head portion opposed to the connecting pad, the protruded portion formed to take a hemispherical shape which is convexed toward the connecting pad, the hemispherical shaped protruded portion having a diameter which is less than the diameter of the head portion; a first taper portion which is formed between the head portion and a base part of the shaft portion, said first taper portion tapering outwardly from the base part of the shaft portion toward an outer edge of the head portion; and a second taper portion which is formed between the head portion and a base part of the protruded portion, wherein the base part of the protruded portion is provided at an angle relative to the second taper portion.