Patent ID: 8459860

Claim:
A light flux controlling member that is arranged on an edge side of illumination-target members together with a light-emitting device, emits light emitted from the light-emitting device from an output surface after causing the light to enter from an input surface, and illuminates illumination-target surfaces of the illumination-target members with the light emitted from the output surface, wherein the input surface includes a first input surface arranged so that the first input surface is positioned on an optical axis of the light-emitting device, which is approximately parallel to the illumination-target surfaces, and positioned opposite to the light-emitting device in a one-to-one correspondence and a second input surface positioned as if to enclose the first input surface, the first input surface is formed in such a way that the light in a center section of a light flux of emitted from the light-emitting device enter then is caused to travel toward the output surface, the second input surface is composed of a group of a plurality of ring-shaped prism projections formed concentrically around the optical axis as if to enclose the first input surface and is formed so that the light other than the light in the center section of the light flux is caused to enter, each of the prism projections include a first inclined surface that causes the light other than the light in the center section of the light flux to enter and a second inclined surface that totally reflects the light entered from the first inclined surface toward the output surface, and the input surface and the output surface are formed in such a way that the light emitted from the output surface via the first input surface with a maximum angle from the optical axis has a larger angle from the optical axis than the light emitted from the output surface via the second input surface with the maximum angle from the optical axis.