An imaging lens for use in an on-vehicle camera, comprising a negative front group; a stop; and a positive rear group, the negative front group, the stop, and the positive rear group being disposed in order from object side toward image side, the front group including a negative first lens having a meniscus shape with a convex surface facing the object side, a negative second lens having the meniscus shape with a convex surface facing the object side, and a positive third lens having a biconvex shape, and the rear group including a positive fourth lens, a negative fifth lens with a concave surface facing the image side, and a positive sixth lens, wherein the half field angle of the imaging lens is 88 degrees or greater, wherein both surfaces of each of the second, third, fourth, fifth, and sixth lenses are aspherical, wherein the imaging lens further satisfies the following condition, 1.0 < R 3 + R 4 / R 3 − R 4 < 1.6 where R3 is a radius of curvature of the surface on the object side of the second lens, and R4 is a radius of curvature of a surface on the image side of the second lens, wherein the imaging lens further satisfies the following condition, − 12 < f 1 / f < − 5 where f1 is a focal length of the first lens, and f is a focal length of a lens entire system, wherein the imaging lens further satisfies the following condition, fi / f > 1.3 where fi is a focal length of the i-th lens (i=1 to 6) (a focal length of each of the first lens to the sixth lens), and wherein the first lens and the sixth lens are made of glass, and the imaging lens satisfies the following condition, 20 < fp where fp is a composite focal length of the second to the fifth lenses. the front group including a negative first lens having a meniscus shape with a convex surface facing the object side, a negative second lens having the meniscus shape with a convex surface facing the object side, and a positive third lens having a biconvex shape, and a negative first lens having a meniscus shape with a convex surface facing the object side, a negative second lens having the meniscus shape with a convex surface facing the object side, and a positive third lens having a biconvex shape, and the rear group including a positive fourth lens, a negative fifth lens with a concave surface facing the image side, and a positive sixth lens, a positive fourth lens, a negative fifth lens with a concave surface facing the image side, and a positive sixth lens, wherein the half field angle of the imaging lens is 88 degrees or greater, wherein both surfaces of each of the second, third, fourth, fifth, and sixth lenses are aspherical, wherein the imaging lens further satisfies the following condition, 1.0 < R 3 + R 4 / R 3 − R 4 < 1.6 where R3 is a radius of curvature of the surface on the object side of the second lens, and R4 is a radius of curvature of a surface on the image side of the second lens, wherein the imaging lens further satisfies the following condition, − 12 < f 1 / f < − 5 where f1 is a focal length of the first lens, and f is a focal length of a lens entire system, wherein the imaging lens further satisfies the following condition, fi / f > 1.3 where fi is a focal length of the i-th lens (i=1 to 6) (a focal length of each of the first lens to the sixth lens), and wherein the first lens and the sixth lens are made of glass, and the imaging lens satisfies the following condition, 20 < fp where fp is a composite focal length of the second to the fifth lenses.