An antenna switch circuit which suppresses production of a cross modulation distortion includes an input terminal and an output terminal, a field effect transistor connected at a first one of a source electrode and a drain electrode thereof to the input terminal and connected at a second one of the source electrode and the drain electrode to the output terminal, a first controlling power supply to which the drain electrode and the source electrode of the field effect transistor are connected through first and second biasing elements, respectively, a second controlling power supply to which a gate electrode of the field effect transistor is connected through a third biasing element, and a phase shifting element and a feedback resistor connected in series between the second electrode and the gate electrode of the field effect transistor. The field effect transistor is controlled between on and off by varying a voltage of at least one of the first and second controlling power supplies.