Reflection member, illumination device, surface light source device, display device, and electronic apparatus

To provide a reflection member for forming a polygonal irradiated region. A reflection member for reflecting light emitted from a light source comprises: at least one polygonal cell, the at least one polygonal cell having: a center bottom part which has a polygonal shape in a plan view and in which the light source is disposed; and an inclined part which is inclined from the center bottom part toward the outer edge, wherein the inclined part has: vertex-part inclined surfaces which are provided so as to correspond to the respective vertexes of the polygonal shape; and side-part inclined surfaces which are each provided between the corresponding vertex-part inclined surfaces, and wherein an inclination angle alpha of at least a part of the vertex-part inclined surfaces is larger than an inclination angle beta of the side-part inclined surfaces in a cross-sectional view. 本发明提供用于形成多边形的被照射区域的反射部件。种使来自光源的出射光反射的反射部件，其特征在于，包括至少个多边形单元，该多边形单元在俯视时呈多边形的形状，具有供上述光源配置的中央底部和从上述中央底部朝外缘倾斜的倾斜部，上述倾斜部具有与上述多边形的各顶点分别对应设置的顶部倾斜面和设于上