A light flux controlling member for controlling a distribution of light emitted from a light-emitting element includes an incidence surface configured to allow the light to enter the light flux controlling member; an emission surface configured to emit light; and a reflection part including an inclined surface configured to reflect light entered from the incidence surface, wherein in a cross-section, a region where light emitted from a light emission center of the light-emitting element that is entered from the incidence surface and sequentially reflected by the emission surface and the inclined surface reaches in the emission surface includes a portion where a derivative value of a gradient of a tangent to a given point in the emission surface is 0, or a portion where a sign of the derivative value reverses.