Patent ID: 8278147

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: wherein a first wiring line of the wiring lines is formed in a first package substrate-forming area of the package substrate-forming areas, a second wiring line of the wiring lines is formed in a second package substrate-forming area adjacent to the first package substrate-forming area, and the first wiring line is electrically separated from the second wiring line by the groove having been formed; (b) mounting a plurality of semiconductor chips on the package substrate-forming areas, respectively; (c) electrically connecting the semiconductor chips with the bonding pads, via the plating film, respectively; and (d) cutting the wiring substrate by using a dicing blade to separate the first package substrate-forming area from the second package substrate-forming area, wherein the groove extends only partially through thickness of the wiring substrate, wherein a width of the dicing blade is smaller than a width of the groove, and wherein step (d) includes running the dicing blade inside the groove.