A communication module includes a power amplifier that amplifies a transmission signal having a first communication system or a second communication system and outputs an amplified signal to a signal path, a switch circuit that switches between a signal path for the first communication system and a signal path for the second communication system and outputs the amplified signal to one of the signal paths for the first communication system and the second communication system in accordance with a control signal supplied in accordance with the communication system of the transmission signal, and an impedance-matching network disposed between the power amplifier and the switch circuit, the impedance-matching network including a first variable capacitance element. The first variable capacitance element has a capacitance value that is controlled in accordance with the communication system of the transmission signal.