COMPACT LENS

PROBLEM TO BE SOLVED: To provide a compact lens capable of preventing a vignetting phenomenon, realizing thinning and high density and having high optical performance suitable for a high-pixel imaging device. SOLUTION: This lens is equipped with a first lens group I consisting of a first lens 1 having negative refractive power and a second lens 2 having positive refractive power, and a second lens group II consisting of a third lens 3 having negative refractive power, a fourth lens 4 bonded to the third lens and having positive refractive power and a hybrid aspherical lens (fifth lens) 5 having positive refractive power, made biconvex and set so that the positive refractive power may get weaker toward a peripheral part in order from an object side, and satisfies following conditional expressions (1), (2) and (3). (1) 0.7|R6|2.f2, provided that R6 and R8 mean the radii of curvature of the surface on the object side of the third lens and the surface on an image surface side of the fourth lens, νi means the Abbe number of an i-th lens, and f1 and f2 mean the synthetic focal distance of the first and the second lens groups.