An imaging apparatus, comprising: an image formation lens, a single light receiving section having a plurality of light receiving elements; a plurality of optical elements two-dimensionally arranged and respectively provided corresponding to a plurality of the light receiving elements to make the corresponding light receiving elements receive an object light beam that passed through a predetermined pupil region among a plurality of pupil regions respectively corresponding to a plurality of regions in an exit pupil of the image formation lens; and an image generation section adapted to generate an image of an object from imaging signals of a plurality of the light receiving elements, characterized in that said image formation lens is a single lens in which each of a plurality of regions has a different focal length; a plurality of first optical elements out of the plurality of the optical elements make, irrespective of a position in the two-dimensional arrangement, a first object light beam, which passes through a region having a first focal length of the image formation lens and a first pupil region corresponding to the first focal length in the exit pupil, incident into the corresponding first light receiving elements, and make the first object light beam not incident into light receiving elements other than the first light receiving elements, a plurality of second optical elements out of the plurality of the optical elements make irrespective of a position in the two-dimensional arrangement, a second object light beam, which passes through a region having a second focal length of the image formation lens and a second pupil region corresponding to the second focal length in the exit pupil, incident into the corresponding second light receiving elements, and make the second object light beam not incident into light receiving elements other than the second light receiving elements, the image generation section selects, for generation of the image of the object, any one of the pupil regions (122a, 122b) in the exit pupil through which a light beam passes and generates the image of the object with use of imaging signals of a plurality of the light receiving elements that receive an object light beam that passed through the selected pupil region (122a, 122b), and for generation of the image of the object, the image generation section selects, based on an object distance and focal lengths each corresponding to a plurality of the pupil regions (122a, 122b) of the exit pupil, at least one of the pupil regions through which an object light beam that forms an image at a position of the light receiving section passes. an image formation lens, a single light receiving section having a plurality of light receiving elements; a plurality of optical elements two-dimensionally arranged and respectively provided corresponding to a plurality of the light receiving elements to make the corresponding light receiving elements receive an object light beam that passed through a predetermined pupil region among a plurality of pupil regions respectively corresponding to a plurality of regions in an exit pupil of the image formation lens; and an image generation section adapted to generate an image of an object from imaging signals of a plurality of the light receiving elements,