a signal input terminal to which a high-frequency signal to be switched is input;

a plurality of amplifying circuits with transistors to respectively amplify the high-frequency signal to be switched sequentially, the amplifying circuits being cascade-connected in a plurality of stages to the signal input terminal;

a signal output terminal which is connected to an output section of an amplifying circuit at final stage among the plurality of amplifying circuits, and which outputs the high-frequency signal to be switched sequentially amplified;

a control terminal to which a pulse signal serving as a switching signal and having a period of a first level and a period of a second level is input; and

a supply current control circuit which makes the plurality of amplifying circuits be in an amplification-operational state by supplying operational current to each of the transistors of the plurality of amplifying circuits in a period when the pulse signal input to the control terminal is at the first level, and which makes the plurality of amplifying circuits be in a non-amplification-operational state by stopping supplying operational current to each of the transistors of the plurality of amplifying circuits in a period when the pulse signal is at the second level,

the high-frequency electronic switch which turns on/off between the signal input terminal and the signal output terminal substantially high-frequency likewise in accordance with a level of the pulse signal input to the control terminal.