A high frequency circuit includes a transmit terminal and a transmit and receive terminal, a power amplifier that amplifies a high frequency signal inputted from the transmit terminal and outputs the high frequency signal toward the transmit and receive terminal, and an output matching circuit that is positioned on a signal path connecting the power amplifier and the transmit and receive terminal and that optimizes the output load impedance of the power amplifier. The output matching circuit includes a matching circuit coupled to an output terminal of the power amplifier, another matching circuit, and a switch that changes a connection between the matching circuits. The power amplifier and the switch are formed at a single semiconductor IC. The matching circuits are formed outside the semiconductor IC.