An imaging apparatus includes: an imaging optical system that obtains an optical image of a photographic subject; a plurality of image sensor elements that output image data based on the optical image of the photographic subject obtained by the imaging optical system; an electric power supply controller that controls electric power supply to the plurality of image sensor elements; and a distance metering device that includes the plurality of image sensor elements and the electric power supply controller, and measures a distance to the photographic subject based on an output of the image sensor elements, wherein the plurality of image sensor elements are aligned in line and formed on one semiconductor wafer, and the electric power supply controller performs electric power supply to the plurality of image sensor elements in accordance with operating conditions set to the imaging apparatus.