A compact low-profile low-cost imaging lens which provides brightness with an F-value of 2.5 or less and a wide field of view and corrects aberrations properly. The elements are arranged from an object side as follows: a positive first lens having a convex object-side surface; a meniscus negative second lens having a concave object-side surface; a double-sided aspheric third lens; a double-sided aspheric fourth lens; a positive fifth lens having a convex image-side surface near an optical axis; and a double-sided aspheric negative sixth lens having a concave image-side surface near the axis. Each element is arranged with an air gap from a neighboring element. The sixth lens image-side surface has an off-axial pole-change point. The imaging lens satisfies conditional expressions below: 20