Patent ID: 7470567

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) providing a wiring substrate having a plurality of unit substrate regions from which semiconductor devices are to be manufactured respectively, the wiring substrate having a first main surface and a second main surface located on the side opposite to the first main surface, with a plurality of first electrodes being formed over the first main surface of each of the unit substrate regions and a plurality of land portions formed over the second main surface of each of the unit substrate regions; (b) mounting semiconductor chips over the unit substrate regions respectively over the first main surface of the wiring substrate and coupling a plurality of second electrodes of the semiconductor chips electrically to the first electrodes of the wiring substrate; (c) forming a sealing resin over the unit substrate regions over the first main surface of the wiring substrate so as to cover the semiconductor chips, thereby forming a sealing body comprising the wiring substrate and the sealing resin; (d) cutting the sealing body with a dicing blade along the dicing regions between the unit substrate regions from the first main surface side of the wiring substrate such that the dicing blade reaches a part of the wiring substrate; (e) after the step (d), forming external connecting terminals over the land portions respectively in the unit substrate regions over the second main surface of the wiring substrate; and (f) after the step (e), cutting the wiring substrate with another dicing blade along the dicing regions from the second main surface side of the wiring substrate such that the another dicing blade reaches the part of the wiring substrate.