An imaging apparatus includes a plurality of imaging optical systems, and an imaging device having a plurality of imaging regions, each corresponding to one of the plurality of imaging optical systems. The plurality of imaging optical systems are arranged such that (2M+1)×(2N+1) imaging optical systems are arranged two-dimensionally in a horizontal direction and a vertical direction, where M and N are integers of 1 or more. A difference between a shift amount of the reference imaging optical system and a shift amount of an imaging optical system other than the reference imaging optical system is 2×Km/(2M+1) pixels in a horizontal direction and 2×Kn/(2N+1) pixels in a vertical direction, where Km is an integer satisfying −M≤Km≤M, and Kn is an integer satisfying −N≤Kn≤N.