Patent ID: 8373997

Claim:
A semiconductor device, comprising: a wiring board including a first surface, a second surface opposite to the first surface, a cavity formed therein on the first surface side and a wiring portion formed thereon around the cavity; a semiconductor element mounted on a bottom surface of the cavity via an adhesive, the semiconductor element having an electrode terminal connected via a wire to the wiring portion of the wiring board; and a heat-radiating structure, wherein the semiconductor element is mounted in close contact with a side wall of the cavity, the side wall being near a region where a wiring for higher frequency compared with other wirings within the wiring portion is formed, and the heat-radiating structure is provided in a region of the bottom surface of the cavity, in which a recessed portion filled with the adhesive is provided, the region being near a portion where the semiconductor element is in close contact with the side wall, the heat-radiating structure being formed through the writing board in a direction from the bottom surface of the recessed portion and the bottom surface of the cavity other than the bottom surface of the recessed portion toward the second surface.