A vehicle headlamp for illuminating a light distribution pattern toward a forward direction of a vehicle by changing it over to a light distribution pattern for low beam (light distribution pattern for passing), having an oblique cutoff line and a horizontal cutoff line, or a light distribution pattern for high beam (light distribution pattern for cruising), comprising: a holder; an upside movable reflector, which is rotatably held on the holder; a light source (5U, 5D) which is fixed and held on the holder; and a drive unit for changing over a light distribution pattern while rotating the upside movable reflector between a first location and a second location, wherein: the drive unit includes: a drive source which is held on the holder; and a drive force transmission mechanism, characterized by: a downside movable reflector which is rotatably held on the holder, wherein the drive unit is adapted to rotate the downside movable reflector between a first location and a second location in synchronism with the upside movable reflector, and wherein the drive force transmission mechanism is held on a lateral site relative to the upside movable reflector, the downside movable reflector and the light source (5U, 5D) of the holder, and is provided between the drive source and a respective one of the upside movable reflector and the downside movable reflector, for transmitting a drive force generated in the drive source to the upside movable reflector and the downside movable reflector, respectively, to rotate the upside movable reflector and the downside movable reflector, respectively, in reverse directions. a holder; an upside movable reflector, which is rotatably held on the holder; a light source (5U, 5D) which is fixed and held on the holder; and a drive unit for changing over a light distribution pattern while rotating the upside movable reflector between a first location and a second location, wherein: the drive unit includes: a drive source which is held on the holder; and a drive force transmission mechanism, the drive unit includes: a drive source which is held on the holder; and a drive force transmission mechanism, a drive source which is held on the holder; and a drive force transmission mechanism, characterized by: a downside movable reflector which is rotatably held on the holder, wherein the drive unit is adapted to rotate the downside movable reflector between a first location and a second location in synchronism with the upside movable reflector, and wherein the drive force transmission mechanism is held on a lateral site relative to the upside movable reflector, the downside movable reflector and the light source (5U, 5D) of the holder, and is provided between the drive source and a respective one of the upside movable reflector and the downside movable reflector, for transmitting a drive force generated in the drive source to the upside movable reflector and the downside movable reflector, respectively, to rotate the upside movable reflector and the downside movable reflector, respectively, in reverse directions. a downside movable reflector which is rotatably held on the holder, wherein the drive unit is adapted to rotate the downside movable reflector between a first location and a second location in synchronism with the upside movable reflector, and wherein the drive force transmission mechanism is held on a lateral site relative to the upside movable reflector, the downside movable reflector and the light source (5U, 5D) of the holder, and is provided between the drive source and a respective one of the upside movable reflector and the downside movable reflector, for transmitting a drive force generated in the drive source to the upside movable reflector and the downside movable reflector, respectively, to rotate the upside movable reflector and the downside movable reflector, respectively, in reverse directions.