A mixer which has an enhanced frequency selection characteristic and generates no pass loss is realized without using an operation control signal having a frequency higher than a sampling frequency. Provided are a time control section 102 for supplying control signals, a first switched capacitor circuit 100 for outputting a discrete time sample stream of the input signal 107 in accordance with integration operation control signals Lo1 and Lo2, and a second switched capacitor circuit 104 functioning as a high-order IIR filter by sharing a charge, and a frequency of each of the integration operation control signals Lo1 and Lo2 is higher than frequencies of other control signals.