An image-taking apparatus is disclosed that includes an image-pickup portion having a plurality of image-pickup regions, and a plurality of image-forming portions respectively corresponding to the plurality of image-pickup regions. The plurality of image-forming portions of the image-taking apparatus include a combination of image-forming portions that form object images on the corresponding image-pickup regions, by using light of mutually different wavelength regions. The image-forming portions constituting the combination have mutually different F numbers or mutually different apertures diameters of stops.