The invention provides a frequency conversion circuit capable of more correctly controlling conversion gain. The frequency conversion circuit (3) includes: a first input terminal (3a) input with a first input signal; a second input terminal (3b) input with a second input signal; an output terminal (3c) outputting an output signal; a transistor (3d) for mixing of which one end is connected with the first input terminal and the other end is connected with the output terminal; and a pulse control circuit (3e) which is input with the second input signal through the second input terminal and outputs pulse signal obtained by restricting the pulses of the second input signal to a control electrode of the transistor (3d) for mixing. The transistor (3d) for mixing and pulse of the pulse signal arecorrespondingly conducted.