A solid-state imaging apparatus includes: a plurality of pixels; a reference signal generating circuit configured to generate a ramp signal; a counter performing a counting operation according to the changing of the ramp signal; a read out circuit having a comparator comparing a signal read out from the pixel with the ramp signal, and converting an analog signal outputted from the pixel to a digital signal; and a control circuit configured to adjust a reset potential to be used when the comparator is reset, wherein the control circuit obtains a conversion value derived by converting an analog signal derived of a reset level of the pixel to a digital signal, and adjusts a reference potential based on the conversion value to make a dynamic range of A/D conversion follow the fluctuation of the reset level of the pixel.