To uniformize light radiation from an LED by minimizing discontinuity of light in the axial direction and in the nonaxial directions.

To control and uniformize light radiation by forming a notch 303 in the packaging structure of a light-emitting diode in the axial direction. The shape of the notch is a cylinder of which the upper surface 304 and the bottom surface 305 have different areas, a cylinder which has a curved surface, and of which the upper surface 304 and the bottom surface 305 have different areas, or an inverted cone shape.