Headlight for irradiating light beam for a vehicle passing by in the opposite direction

In a headlight exclusively usable for irradiating a light beam for vehicle passing by in an opposite direction, said headlight including a light source and a reflective mirror, and said headlight emitting light in an irradiating direction,

• the improvement wherein said reflective mirror comprises:
• a lower half including a first reflective surface extending continuously in an unbroken manner to opposite sides of said lower half and having a contour of a revolving parabolic plane arranged on the lower half of said reflective mirror so as to cause a light beam generated by said light source to be reflected in the shape of a substantially parallel light beam in a predetermined downward direction, and
• an upper half including:
• a second reflective surface having a contour of a revolving parabolic plane arranged at a central part of the upper half of said reflective mirror so as to cause said light beam generated by said light source to be reflected in the form of a substantially parallel light beam oriented in another predetermined downward direction, and
• third and fourth reflective surfaces each having a contour of a cylindrical parabolic plane so as to cause said light beam generated by said light source to be irradiated in the irradiating direction of said headlight, said third and fourth reflective surfaces being arranged on opposite sides of said second reflective surface on the upper half of said reflective mirror, and said third and fourth reflective surfaces each comprising a fifth surface and a sixth surface, said fifth surface serving to cause said light beam generated by said light source to be converged in the form of a substantially parallel light beam as seen in one direction and said sixth surface serving to cause said light beam generated by said light source to be converged in the shape of a substantially parallel light beam as seen in another direction at a right angle relative to said one direction.