the entrance region of this light flux control member has second protruding strips disposed at the edges of a virtual quadrangle , and angle parts disposed at the four corners of the virtual quadrangle . the angle parts having a third entrance face , and a third reflective face establishing a connection between two neighboring second reflective faces . the height of a third crest line at the boundary between the third entrance face and the third reflective face decreases gradually as a diagonal line of the virtual quadrangle is approached . the distance between the outermost edge of the third reflective face and the third crest line decreases gradually as the diagonal line of the virtual quadrangle is approached . the distance between the extremities of a second crest line of the second protruding strip is shorter than the distance between the extremities of a first crest line located most outward .