A solid-state imaging device comprises a plurality of pixels disposed in a two-dimensional pattern and each equipped with a photoelectric conversion unit that generates and accumulates a signal charge corresponding to a subject image formed with light entering from an optical system and a readout control unit that executes control under which signals are read out from the plurality of pixels. The plurality of pixels include a plurality of imaging pixels that output imaging signals for forming image signals that represents the subject image and a plurality of focus detection pixels that output focus detection signals for detecting a focusing condition of the optical system through a split-pupil phase difference method.