To provide a CIC filter capable of flexibly setting a cut-off frequency without depending on a system clock frequency.

The delay block of the CIC filter 6 is constituted of a flip-flop 15 with a data enable function, clock signals outputted from an NCO 14 are supplied to the flip-flop 15 on the basis of a system clock clk, thereby making the cut-off frequency changeable. In this case, a system clock signal clk is supplied to a clock terminal, and the clock signal low_en generated by the NCO 14 is supplied to a data enable terminal DEN.