Light flux controlling member, light-emitting device, illumination apparatus, and mold

A light flux controlling member that controls a distribution of light emitted from a light emitting element, the light flux controlling member comprising:

• an incidence region on which light emitted from the light emitting element is incident;
• and
• an emission region from which light incident on the incidence region is emitted,
• wherein the incidence region includes a plurality of protrusions each having a ridgeline connecting two adjacent first virtual lines of four first virtual lines, each of the four first virtual lines connecting a vertex of a first virtual quadrangle with an intersection of diagonals of the first virtual quadrangle,
• wherein the plurality of protrusions are disposed such that every two of the plurality protrusions adjacent to each other have a valley part between the two adjacent first virtual lines,
• wherein in plan view, at least one of a plurality of ridgelines is a first ridgeline forming one arc shape entirely between the two adjacent first virtual lines connected by the first ridgeline, and
• wherein the first ridgeline having curvature radius greater than a distance from the intersection to a middle point of the first ridgeline.