| 摘要 |
Light flux controlling member (100) includes emission surface (110) that includes emission concave portion (111) formed so as to intersect with optical axis (LA) of light emitting element (210), incidence surface (120) that constitutes an inner surface of incidence concave portion (121) formed on the opposite side of emission concave portion (111), and back surface (130) that extends in a direction perpendicular to optical axis (LA) from an opening edge portion of incidence concave portion (121). A cross section of at least one of emission surface (110) and incidence surface (120) which is perpendicular to optical axis (LA) has an elliptical shape. |
