A compact low-cost imaging lens which provides high brightness with an F-value of 2.5 or less and a wide field of view and corrects aberrations properly, meeting the demand for low-profile design. The imaging lens elements are arranged in the following order from an object side to an image side: an aperture stop; a first lens with positive refractive power having a convex surface on each of the object and image sides; a second lens with negative refractive power; a third lens with positive refractive power having a convex surface on each of the object and image sides; a fourth lens with negative refractive power; and a fifth lens with negative refractive power as a double-sided aspheric lens. The imaging lens satisfies a conditional expression (1) below: 1.5