An imaging apparatus comprising: a bifocal lens having a first region with a first characteristic and a second region with a second characteristic different from the first characteristic; an image pickup device having a first light-receiving element group and a second light-receiving element group which are two-dimensionally arranged; optical elements (12a, 12b) for providing pupil directivity for each of a light beam incident on the first light-receiving element group and a light beam incident on the second light-receiving element group, the optical elements (12a, 12b) being provided correspondingly to the first light-receiving element group and the second light-receiving element group of the image pickup device, and letting only a light beam passing through the first region of the bifocal lens received by the first light-receiving element group and letting only a light beam passing through the second region of the bifocal lens received by the second light-receiving element group; and an image generating unit (40, 24, 25) configured to obtain a first imaging signal or a second imaging signal from the first light-receiving element group or the second light-receiving element group of the image pickup device, respectively, and configured to generate a first image or a second image, respectively, wherein the image generating unit generates the first image and the second image based on the first imaging signal and the second imaging signal from the first light-receiving element group and the second light-receiving element group, respectively, and the bifocal lens has the first characteristic in which a focus is achieved on a far view and the second characteristic in which the focus is achieved on a near view, characterized in that: the image pickup device includes both first and second light-receiving elements (162a, 162b) in a lower region as well as in an upper region thereof; and an arrangement density of the first light-receiving element group of the image pickup device is higher in a lower region of the image pickup device than in a higher region of the image pickup device, and an arrangement density of the second light-receiving element group of the image pickup device is higher in the higher region than in the lower region. a bifocal lens having a first region with a first characteristic and a second region with a second characteristic different from the first characteristic; an image pickup device having a first light-receiving element group and a second light-receiving element group which are two-dimensionally arranged; optical elements (12a, 12b) for providing pupil directivity for each of a light beam incident on the first light-receiving element group and a light beam incident on the second light-receiving element group, the optical elements (12a, 12b) being provided correspondingly to the first light-receiving element group and the second light-receiving element group of the image pickup device, and letting only a light beam passing through the first region of the bifocal lens received by the first light-receiving element group and letting only a light beam passing through the second region of the bifocal lens received by the second light-receiving element group; and an image generating unit (40, 24, 25) configured to obtain a first imaging signal or a second imaging signal from the first light-receiving element group or the second light-receiving element group of the image pickup device, respectively, and configured to generate a first image or a second image, respectively, wherein the image generating unit generates the first image and the second image based on the first imaging signal and the second imaging signal from the first light-receiving element group and the second light-receiving element group, respectively, and the bifocal lens has the first characteristic in which a focus is achieved on a far view and the second characteristic in which the focus is achieved on a near view, characterized in that: the image pickup device includes both first and second light-receiving elements (162a, 162b) in a lower region as well as in an upper region thereof; and an arrangement density of the first light-receiving element group of the image pickup device is higher in a lower region of the image pickup device than in a higher region of the image pickup device, and an arrangement density of the second light-receiving element group of the image pickup device is higher in the higher region than in the lower region. the image pickup device includes both first and second light-receiving elements (162a, 162b) in a lower region as well as in an upper region thereof; and an arrangement density of the first light-receiving element group of the image pickup device is higher in a lower region of the image pickup device than in a higher region of the image pickup device, and an arrangement density of the second light-receiving element group of the image pickup device is higher in the higher region than in the lower region.