To provide a mixer circuit that implements a high conversion gain and a low power consumption.

A mixer circuit 2 includes, in a series connection between a line of supply voltage VCC and a line of ground voltage VSS: a transconductance section 5 for converting high frequency voltage signals VRF, /VRF to high frequency current signals IRF, /IRF; a PPF 10 for converting the signals IRF, /IRF to complex current signals Q+1, Q-1, I+1, I-1; a frequency conversion section 20 for mixing the signals Q+1, Q-1, I+1, I-1 with local oscillator signals LO, /LO to generate complex current signals Q+, Q-, I+, I-; and a load section 30 for converting the signals Q+, Q-, I+, I- to complex voltage signals Q, /Q, I, /I.