PURPOSE: To provide a switched capacitor inverting phase integration device in which an integration time within one sampling period is extended.

CONSTITUTION: The device is provided with switches 11-17, capacitors 31-34 and an operational amplifier 4, the switches 14, 17 are closed when a clock 1 is in an ON state in clocks 1, 2 whose ON periods are not overlapped with each other, and the switches 15, 16 are closed when the clock 92 is in an ON state. Furthermore, the capacitor 31 is discharged when the clocks 1, 2 are in an OFF state. Thus, an input signal Vi is fetched alternately through the combination of the capacitors 31, 34 and 31, 32, and when the clock 1 is set, the charge stored in the capacitor 17 is fed to the integration capacitor 33 and when the clock 92 is set, the charge stored in the capacitor 17 is fed to the integration capacitor 33.