PURPOSE: To obtain a compact and inexpensive lens in which each aberration has been corrected in a high level, by providing a positive meniscus lens whose convex surface has been turned to an object side, a biconcave lens, a biconvex lens, and a diaphragm in order from the object side, and satisfying specific conditions.

CONSTITUTION: The titled lens consists of three groups and three pieces by placing a first lens being a positive meniscus lens, whose convex surface has been turned to an object side, a second lens being a biconcave lens, a third lens being a biconvex lens, and a diaphragm in order from the object side, and satisfies each condition of the inequalities. In this way, a compact and inexpensive lens being a behind-diaphragm type triplet lens of F/3.5, 68° view angle, and about 1.05 telephoto ratio, and in which each aberration has been corrected in a high level is obtained.