1. An image capturing apparatus comprising: an image capturing section that successively captures a plurality of images under a plurality of image capturing conditions set to have different exposure time lengths and aperture openings from each other and result in a same amount of exposure as each other; an image generating section that generates an output image by overlapping the plurality of captured images captured under the plurality of image capturing conditions; and an output section that outputs the output image generated by the image generating section; wherein the image generating section generates the output image by averaging pixel values of the plurality of captured images; and wherein the image generating section generates a plurality of output images from the plurality of captured images respectively captured in different periods by the image capturing section, and the output section outputs an output moving image including the plurality of output images as moving image constituting images.