A solid-state imaging apparatus comprising: an A/D converter; and a plurality of time code transfer sections; wherein the A/D converter includes a differential input circuit configured to operate on a first power supply voltage and to output a signal when a voltage of a pixel signal is higher than a voltage of a reference signal, a voltage conversion circuit configured to convert the output signal from the differential input circuit into a signal corresponding to a second power supply voltage, a positive feedback circuit configured to operate on the second power supply voltage lower than the first power supply voltage and to accelerate a transition rate at which a comparison result signal is inverted, on a basis of the output signal from the differential input circuit, the comparison result signal being indicative of a result of a comparison in voltage between the pixel signal and the reference signal, and a data storage section configured to store a time code at the time the comparison result signal is inverted and to output the time code to the time code transfer section, and the plurality of time code transfer sections each include a shift register configured to successively transfer the time code to an output section. an A/D converter; and a plurality of time code transfer sections; wherein the A/D converter includes a differential input circuit configured to operate on a first power supply voltage and to output a signal when a voltage of a pixel signal is higher than a voltage of a reference signal, a voltage conversion circuit configured to convert the output signal from the differential input circuit into a signal corresponding to a second power supply voltage, a positive feedback circuit configured to operate on the second power supply voltage lower than the first power supply voltage and to accelerate a transition rate at which a comparison result signal is inverted, on a basis of the output signal from the differential input circuit, the comparison result signal being indicative of a result of a comparison in voltage between the pixel signal and the reference signal, and a data storage section configured to store a time code at the time the comparison result signal is inverted and to output the time code to the time code transfer section, and a differential input circuit configured to operate on a first power supply voltage and to output a signal when a voltage of a pixel signal is higher than a voltage of a reference signal, a voltage conversion circuit configured to convert the output signal from the differential input circuit into a signal corresponding to a second power supply voltage, a positive feedback circuit configured to operate on the second power supply voltage lower than the first power supply voltage and to accelerate a transition rate at which a comparison result signal is inverted, on a basis of the output signal from the differential input circuit, the comparison result signal being indicative of a result of a comparison in voltage between the pixel signal and the reference signal, and a data storage section configured to store a time code at the time the comparison result signal is inverted and to output the time code to the time code transfer section, and the plurality of time code transfer sections each include a shift register configured to successively transfer the time code to an output section.