Patent ID: 7732908

Claim:
A semiconductor device, comprising: a wiring board having a first surface provided with an element mounting section and connection pads, and a second surface on a side opposite to the first surface; a first element group including a plurality of semiconductor elements with electrode pads arranged along one outline side, the semiconductor elements being stacked in a step-like shape on the element mounting section of the wiring board with the outline sides directed to the same direction and the electrode pads exposed; a second element group including a plurality of semiconductor elements with electrode pads arranged along one outline side, the semiconductor elements being stacked in a step-like shape on the first element group in a direction opposite to the stepped direction of the first element group with the outline sides directed to the same direction and the electrode pads exposed; first metallic wires electrically connecting the electrode pads of the semiconductor elements configuring the first element group and the connection pads of the wiring board; second metallic wires electrically connecting the electrode pads of the semiconductor elements configuring the second element group and the connection pads of the wiring board; and a sealing resin layer formed on the first surface of the wiring board to seal the first and second element groups together with the first and second metallic wires, wherein the lowermost semiconductor element among the plurality of semiconductor elements configuring the second element group has a thickness larger than those of the other semiconductor elements among the plurality of semiconductor elements configuring the second element group.