Patent ID: 8669138

Claim:
A manufacturing method of a semiconductor device comprising: a connecting pad forming step of forming connecting pads on a first main surface of a substrate; a connecting step of disposing a semiconductor chip such that the semiconductor chip opposes the first main surface of the substrate and connecting the connecting pads to input/output terminals provided on a first main surface of the semiconductor chip; an underfill material injecting step of injecting an underfill material in a space between the substrate and the semiconductor chip; a molding material forming step of forming a molding material that encapsulates side surfaces of the semiconductor chip and the first main surface of the substrate, which is not covered with the underfill material; and a first thinning step of thinning the substrate from a side of a second main surface thereof, wherein in the molding material forming step, the substrate, except the second main surface thereof, and the semiconductor chip are immersed into a molding material melt and are pressed by applying pressure thereto from the side of the second main surface of the substrate at a specified temperature for a specified period in a vacuum environment, and the molding material melt is cured, so as to form the molding material, wherein in the molding material forming step, the second main surface of the substrate is fixed to a film-shaped jig, and when the substrate and the semiconductor chip are immersed into the molding material melt and pressed by applying pressure thereto, the pressure is applied from a side of the film-shaped jig.