Abstract: A headlamp for a vehicle adapted to radiate a light beam therefrom exclusively for passing-by vehicles includes a single filament, a main reflector, an auxiliary reflector and a lens. The auxiliary reflector is divided into two parts, i.e., an upper auxiliary reflector and a lower auxiliary reflector along a horizontal line extending through the filament. The upper auxiliary reflector, has a focus which is located at the position in the vicinity of the rearmost end of the filament, while the lower auxiliary reflector has a focus which located at the position in the vicinity of the foremost end of the filament. The auxiliary reflector is basically arranged in the region where the main reflector can not completely collect a light beam radiated from the filament. The upper and lower auxiliary deflectors have an inner diameter and an outer diameter, respectively.

Abstract: A composite reflecting mirror for a headlamp comprises a plurality of paraboloidal columnar reflecting surfaces, the reflecting surfaces having their respective focal points fall on a horizontal line extending through approximately the axis of symmetry of the mirror. The composite reflecting mirror is laterally substantially divided into three portions, i.e., a left end portion, a right end portion and a central portion. The relationship of the average value of the focal lengths of the plurality of paraboloidal columnar reflecting surfaces included in the respective portions is such that the average value of the focal lengths of the left end portion is greater than that of the central portion, and the average value of the focal lengths of the right end portion is greater than that of the central portion.