There are provided a plurality of first ADCs that respectively have voltages of a plurality of power storage cells of a power storage module as inputs. There are provided first reference voltage portions that are provided to respectively correspond to the first ADCs and supply reference voltages VRn used as a criterion for a conversion operation. A selector selects any one of the reference voltages VRn and supplies the selected reference voltage to a second ADC. A voltage value corrector corrects a voltage value of the power storage cell obtained by a voltage value acquirer on the basis of correction data obtained by using a digital signal output from the second ADC.