Patent ID: 6902955

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: providing a flexible wiring substrate having a front surface, a back surface opposite from the front surface, a plurality of device areas on the front surface and a plurality of electrodes formed on each device area; providing semiconductor chips each having a main surface, a back surface opposed of the main surface thereof and a plurality of electrodes formed on the main surface; mounting the semiconductor chips respectively on the device areas of the front surface of the flexible wiring substrate; connecting electrodes of the semiconductor chips with the electrodes of the flexible wiring substrate on respective device areas of the front surface of the flexible wiring substrate by means of conductive members; sealing the semiconductor chips and the plural device areas of the front surface of the flexible wiring substrate by a resin body formed according to a block molding method; and cutting the flexible wiring substrate and the resin body to divide them between respective device areas of the front surface of the flexible wiring substrate using a cutting blade, wherein, in the cutting step, a rotation axis of the cutting blade is positioned over the back surface of the flexible wiring substrate, and cutting all outlines of device areas by moving the cutting blade while feeding the wiring substrate and the resin body in a same direction as rotation of the cutting blade.