An array lens, a compound eye optical system, an imaging device, a measuring method, an evaluating method, and a manufacturing method capable of accurately measuring a position of an optical surface of a lens portion and capable of accurately positioning with respect to a mating object. This array lens has a plurality of lens portions arranged with different optical axes and a flange portion connecting the plurality of lens portions, and the array lens for measurement reference for measuring the position of the lens portion Wherein two reference portions are formed on the flange portion with a predetermined space therebetween, and the first reference portion is formed on the outer side of a range connecting the outer periphery of the outermost lens portion as seen in the optical axis direction .
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