A semiconductor device includes a heat sink, an integrated component in which a ceramic terminal having a microstrip line and a matching circuit are integrated into one unit, a lead fixed to the ceramic terminal, a matching substrate fixed to the heat sink, a semiconductor chip fixed to the heat sink, a plurality of wires configured to connect the matching circuit and the matching substrate and to connect electrically the matching substrate and the semiconductor chip, a frame configured to surround the matching substrate and the semiconductor chip in a plan view, and a cap provided on the frame.