Patent ID: 8760775

Claim:
An imaging lens substantially consisting of five lenses of: a first lens having a convex surface facing an object side in the vicinity of an optical axis and positive refractive power in the vicinity of the optical axis, and at least one of the surfaces of which is aspherical; a second lens having a concave surface facing the object side in the vicinity of the optical axis and negative refractive power in the vicinity of the optical axis, and at least one of the surfaces of which is aspherical; a third lens having a meniscus shape with its convex surface facing the object side in the vicinity of the optical axis and positive refractive power in the vicinity of the optical axis, and at least one of the surfaces of which is aspherical; a fourth lens having negative refractive power in the vicinity of the optical axis, and at least one of the surfaces of which is aspherical; and a fifth lens having a meniscus shape with its convex surface facing the object side in the vicinity of the optical axis and positive refractive power in the vicinity of the optical axis, and at least one of the surfaces of which is aspherical, which are in this order from the object side, wherein the following conditional formulas are satisfied: 1 <f 2 /f 4<3 (2); and Nd 3<1.6 and Nd 5<1.6 (3), where f 2 : a focal length of the second lens, f 4 : a focal length of the fourth lens, Nd 3 : a refractive index of the third lens, and Nd 5 : a refractive index of the fifth lens.