Patent ID: 7528480

Claim:
A circuit board comprising: a semiconductor substrate which includes a plurality of through holes passing from an upper surface to a lower surface thereof; at least one foundation insulating film formed on the upper surface of the semiconductor substrate and on inner peripheral surfaces of the through holes; a plurality of foundation metal layers formed on the at least one foundation insulating film in the through holes and on the upper surface of the semiconductor substrate; a plurality of first wiring lines which are provided on the foundation metal layers on an upper side of the semiconductor substrate, and which have bottomed cylindrical portions located in at least lower parts of the through holes, wherein bottoms of the bottomed cylindrical portions of the first wiring lines constitute connection pad portions; a plurality of solder balls provided on lower surfaces of the connection pad portions of the first wiring lines; a plurality of columnar electrodes provided on the first wiring lines on the upper side of the semiconductor substrate; an insulating film provided between the columnar electrodes on the semiconductor substrate and in inner spaces of the bottomed cylindrical portions of the first wiring lines in the through holes; and a plurality of second wiring lines which are provided on the insulating film and which are connected to the columnar electrodes.