Patent ID: 8063495

Claim:
A semiconductor device comprising: a semiconductor chip; a sealing resin layer stacked on a surface of this semiconductor chip; a post penetrating this sealing resin layer in a stacking direction of the semiconductor chip and the sealing resin layer and protruding from the sealing resin layer, a periphery of the protruding portion being opposedly in contact with a surface of the sealing resin layer in the stacking direction; an external connecting terminal provided on the sealing resin layer and connected to the post; and a stress relaxation layer provided between the semiconductor chip and the post, wherein the post includes an embedded portion embedded in the sealing resin layer and a protrusion connected to this embedded portion and having a tip end protruding from the sealing resin layer, the embedded portion and the protrusion are made of different metallic material from each other, and the rigidity of the embedded portion is lower than that of the protrusion.