An objective is to provide a solid-state image sensor which can reduce the pixel rate while restraining the reduction in the angle of view and the deterioration in image quality when image data is output from the image sensor, and an imaging apparatus using the image sensor. A solid-state image sensor includes: plural photoelectric conversion elements which respectively have color filters being divided into plural groups each including color filters of plural colors, the groups being cyclically provided; and an signal output unit which mixes up digital signals, which are output via the A/D converter, at predetermined sampling positions and at predetermined different rates, and outputs signals which are smaller in number than the photoelectric conversion elements, and sampling gravity centers of the signals output from the signal output unit are at equal intervals.