To provide a light distribution control lens compensating light from a light source whose relative luminous intensity becomes weaker as a radiation angle becomes larger to irradiate an irradiated surface with approximately uniform illuminance.

A light distribution control lens 10 covers a light exit window 14 which opens in a recess 13 of a holder 22 in which a light emitting device 12 is installed, or directly loads the light emitting device on a substrate to cover an area where effective light is emitted, and penetrates the light from the light emitting device 12 to the irradiated body side. The lens axis-symmetrically has a concave surface 16 at an incident part at the center part of a light source side lens surface, a concave surface 18 at an emission part at the center part of an irradiated body side lens surface, and a continuous surface of a convex surface 19 at emission parts at peripheral parts of the concave surface 18, and becomes |r1|<D/2, |r1|<|r2|, and D<CA1<D×1.5 (D is the maximum diameter of the light exit window 14 or a circle, r1 is a curvature radius at the center of the concave surface 16 on the light source side lens surface, r2 is a curvature radius at the center of the concave surface 18 of the irradiated body side lens surface, and CA1 is an incidence effective opening diameter of the concave surface 16 of the light source side lens surface) to control light distribution.