1. An imaging device comprising: a plurality of lenses arranged in the same plane; and a plurality of imaging regions for respectively receiving a plurality of subject images formed by the plurality of lenses; wherein vertical line directions and horizontal line directions of a pixel arrangement in the respective plurality of imaging regions are equal to one another among the plurality of imaging regions, a subject image received by a first imaging region and a subject image received by an imaging region having a parallax in the vertical line direction with respect to the first imaging region among the plurality of imaging regions are shifted from each other by a predetermined amount in the horizontal line direction, the subject image received by the first imaging region and a subject image received by an imaging region having a parallax in the horizontal line direction with respect to the first imaging region are shifted from each other by a predetermined amount in the vertical line direction, a shifting amount Gsx in the horizontal line direction between an optical axis of a lens corresponding to the first imaging region and an optical axis of a lens corresponding to the imaging region having a parallax in the vertical line direction with respect to the first imaging region satisfies |Gsx|≦A 1 ·p/(4·f), where A 1 indicates a lower limit of a subject distance, f indicates a distance between the lenses and the imaging regions, and p indicates a pixel pitch of the imaging regions, and a shifting amount Gsy in the vertical line direction between an optical axis of the lens corresponding to the first imaging region and an optical axis of a lens corresponding to the imaging region having a parallax in the horizontal line direction with respect to the first imaging region satisfies |Gsy|≦A 1 ·p/(4·f), where A 1 indicates the lower limit of the subject distance, f indicates the distance between the lenses and the imaging regions, and p indicates the pixel pitch of the imaging regions.