PURPOSE: To obtain a switched capacitor filter having a new transfer function by resetting a feedback capacitor in fetching an input signal to an input capacitor at the 1st timing so as to transfer the difference between the past data fetched at the 2nd timing and the input signal at that time to the feedback capacitor.

CONSTITUTION: SW1, SW2 are thrown to the position of a changeover contact (b) at the 1st timing. Further, an SW3 is brought into the ON-state. Thus, the input signal fed from an input terminal IN is stored in the input capacitor C1. Further, the feedback capacitor C2 is reset by the ON-state of the SW3. The SW1, SW2 are thrown to the position of a changeover contact (a) in the 2nd timing. Moreover, the SW3 is brought into the OFF-state. Thus, the difference between the input signal fetched at the 1st timing and the input signal fed from the input terminal IN at the 2nd timing is transferred to the feedback capacitor C2.