An imaging lens of which optical performance does not deteriorate even in a high temperature environment, various aberrations are well corrected, optical length is short, and back focus is sufficiently secured. This imaging lens comprises a first junction type compound lens 14, an aperture diaphragm S, a second junction type compound lens 16, and a third junction type compound lens 18, wherein the first junction type compound lens, the aperture diaphragm, the second junction type compound lens, and the third junction type compound lens are arranged in this sequence from an object side to an image side. The first junction type compound lens comprises a first lens, a second lens and a third lens arranged in this sequence from the object side to the image side, the second junction type compound lens comprises a fourth lens, fifth lens and a sixth lens arranged in this sequence from the object side to the image side, and the third junction type compound lens comprises a seventh lens, an eighth lens and a ninth lens arranged in this sequence from the object side to the image side. The first lens, the third lens, the fourth lens, the sixth lens, the seventh lens and the ninth lens are formed of a curable resin material, and the second lens, the fifth lens and the eighth lens are formed of a high softening temperature glass material.