An optical system is arranged on an object side relative to a first optical portion, the first optical portion including a plurality of lens portions each configured to form an image of an object, and a plurality of filters corresponding to the plurality of lens portions, and the optical system includes a second optical portion including an optical surface common to the plurality of lens portions, wherein the following conditional expression is satisfied: 1 2 × arctan ⁢ { 2 × tan ⁢ ⁢ ω ⁢ ⁢ 1 - Δ ⁢ ⁢ h ⁢ ⁢ 1 D ⁢ ⁢ 1 1 - tan ⁢ ⁢ ω ⁢ ⁢ 1 × ( tan ⁢ ⁢ ω ⁢ ⁢ 1 - Δ ⁢ ⁢ h ⁢ ⁢ 1 D ⁢ ⁢ 1 ) }