The present invention is 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, the imaging lens comprising a first junction type compound lens, an aperture stop S, a second junction type compound lens, and a third junction type compound lens, which are arranged in this sequence from an object side to an image side. The first junction type compound lens comprises a first lens L1, a second lens L2 and a third lens L3 arranged in this sequence from the object side to the image side, the second junction type compound lens comprises a fourth lens L4, a fifth lens L5 and a sixth lens L6 arranged in this sequence from the object side to the image side, and the third junction type compound lens comprises a seventh lens L7, an eighth lens L8 and a ninth lens L9 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 optical glass material.