A/D converter and solid-state imaging apparatus with offset voltage correction

An A/D converter comprising:nan input terminal for inputting an analog signal;a reference signal line for connecting to a signal source that generates a reference signal which changes temporally;a comparator which includes a non-inverting input terminal, an inverting input terminal, and an output terminal, and outputs, from the output terminal, an output signal according to a comparison result between a voltage supplied to the non-inverting input terminal and a voltage supplied to the inverting input terminal;a correction capacitor connected to the inverting input terminal of said comparator; andan output circuit which outputs digital data corresponding to the analog signal input to said input terminal,wherein in a first state in which a total charge of a first analog signal and an offset voltage of said comparator is held in said correction capacitor, a second analog signal input to said input terminal is supplied to the non-inverting input terminal of said comparator, and the second analog signal supplied to the non-inverting input terminal of said comparator or the total voltage held in said correction capacitor is changed using the reference signal, thereby outputting, from said output circuit, digital data depending on a time from the beginning of the change until the output signal of said comparator changes as digital data corresponding to the second analog signal.