An imaging device includes: an imaging element as defined herein; a drive control unit as defined herein; an image processing unit as defined herein; a display-image data generation unit as defined herein; and a display control unit as defined herein, and the drive control unit reads out imaging signals from a plurality of pairs including the first photoelectric conversion units and the second photoelectric conversion units and a plurality of the third photoelectric conversion units in the first field period and reads out imaging signals from a plurality of the third photoelectric conversion units in the next field period.