third lens l 3 and an image plane im of an imaging element it is noted that the cover glass 10 may be optionally omitted the first lens l 1 is formed in a shape so that both a curvature radius of a surface thereof on the object side and a curvature radius of a surface thereof on the image side are positive i e it is shaped to form a meniscus lens that directs a convex surface to the object side near an optical axis x the second lens l 2 has a shape such that a curvature radius of a surface thereof on the object side is negative and a curvature radius of a surface thereof on the image side is positive i e it is shaped to form a biconcave lens near the optical axis x the third lens l 3 is formed in a shape so that both a curvature radius of a surface thereof on the object side and a curvature radius of a surface thereof on the image side are positive i e it is shaped to form a meniscus lens that directs a convex surface to the object side near the optical axis x here according to the embodiment the third lens l 3 has an aspheric shape in which both surfaces on the object side and surface on the image side are convex on the object side near the optical axis x and has a concave shape on the object side at periphery thereof in the embodiment all of the lens surfaces of the first lens l 1 through the third lens l 3 are formed to be aspheric surfaces when the aspheric surface applied to the lens surfaces.