To provide an offset correction apparatus in differential amplifier and the method of offset correction which can carry out accurate offset correction for all the output signals and can reduce current consumption.

An offset voltage is stored in a capacitor 204 by outputting an output voltage as a feedback, which is resulted by adding an offset voltage of a differential amplifier 202 to an input voltage from the differential amplifier 202. Then, the input voltage is transmitted to the capacitor 204, the voltage gained by subtracting the offset voltage from the input voltage is input to a non-inversion input stage '+', and at the same time, the offset voltage of the differential amplifier 202 is added to the voltage gained by subtracting the offset voltage from the input voltage, and the output voltage as large as the input voltage is output from an output stage 220.