To provide an image pickup lens which accomplishes an F-number of 2.8 and an viewing angle of 40° despite of few number of lens configuration, and has a long back focal length required for an electronic pickup element and excellent telecentricity, and moreover a very sharp optical focus performance.

Sequentially from an object side, this image pickup lens is configured of a 1st lens L1 with a negative refractive power, a 2nd lens L2 with a positive refractive power, a diaphragm S, a 3rd lens L3 with a negative refractive power, a 4th lens L4 with a negative refractive power, and a 5th lens L5 with a positive refractive power. In this case, expressing that Bf is a back focal length, f is a focal length of the entire system, and α is an angle formed by a principal ray going to the maximum height of the image with the optical axis, the conditional expressions 0.6<Bf/f<0.8, and α<10° are satisfied.