A small high-frequency module has a structure such that a high-power signal is prevented from leaking to a switch device. On the top surface of a multilayer body, a switch device and a duplexer are mounted so as to be spaced apart from each other by a predetermined distance. An inductor and resistors connected to a circuit different from a transmission system circuit are mounted between the switch device and the duplexer. The inductor and the resistors are mounted such that external connection terminals connected to the switch device are on the switch device side and external connection terminals connected to external connection power system port electrodes of the high-frequency module are on the duplexer side.