A solid-state imaging apparatus includes a reference signal generating circuit for supplying, commonly to the plurality of A/D conversion circuits, at least two reference signals of which signal levels change toward different directions of electric potential, and the A/D conversion circuit includes an amplifier; an input capacitor having one terminal receiving the analog signal and the reference signal supplied from the reference signal generating circuit, and the other terminal connected to one input terminal of the amplifier; a feedback capacitor connected between the one input terminal and an output terminal of the amplifier; a comparator for comparing, with a comparing level, an output from the output terminal of the amplifier; and a connection capacitor having one terminal connected to the output terminal of the amplifier, and the other terminal connected to one input terminal of the comparator.