To make a super-wide-angle lens inexpensive by reducing the number of lenses.

A front group lens 1 and a rear group lens 2 are arranged while holding a diaphragm 3 in between. The lens 1 is constituted only of a meniscus concave lens 1a, a meniscus concave lens 1b and a meniscus convex lens 1c successively from an objective side, and the lens 2 is constituted only of a lens obtained by sticking a biconcave spherical lens 2a and a biconvex spherical lens 2b and a biconvex aspherical lens 2c successively from the objective side.