PURPOSE: To enhance brightness and increase the luminous flux by using the center of a light source as a focus, and disposing a reflection surface, which is a paraboloid of revolution having the axis of rotation in the direction of the optical axis, an a spherical reflection surface using the center commonly with the center of the light source.

CONSTITUTION: A reflector 16 is constituted of a plurality of reflection surfaces. The light source center C of a bulb 12 is used as a focus on a plane facing to an optical axis A at the reflection surface 16a, which is a paraboloid of revolution on the optical axis A. The reflection surface 16b is spherical on the light source center C. Light emitted from a light source is reflected on the paraboloid of revolution of the reflection surface 16a and travels forward in parallel to the optical axis A, and then, the light reflected on the spherical surface of the reflection surface 16b returns to the light source center C. The light reflected on the spherical surface of the reflection surface 16b returns to the light source center C, and then, travels toward the reflection surface 16a. The light beams traveling toward the reflection surfaces 16a, 16b can be identically handled, and accordingly, they become light beams in the direction of the optical axis without being consumed as scattered light beams, thereby increasing light intensity in the direction of the optical axis. Furthermore, the light beams are condensed on the light source center C, thus enhancing brightness of the light source.