PURPOSE: To provide an illuminant light conductive lens capable of transmitting light efficiently to an illuminating surface.

CONSTITUTION: An illuminant light conductive lens is provided with an illuminating surface 6 with a specified curved form according to the inclination of an optical axis formed at the top of it, a light receiving part 3 with a cross-sectional area larger than that of the top at which the illuminating surface 6 is formed, and a recessed part 4 formed on the light receiving part 3 at a position faced oppositely to an illuminant 5. Also any surface to reflect light to the light receiving part 3 side is eliminated between the light receiving part 3 and the illuminating surface 6, and a surface 1a is structured with a curved surface.