The present invention provides: semiconductor-type light sources; a fixed reflector having reflection surfaces; movable reflectors having reflection surfaces; a solenoid; and a driving force transmission mechanism. The driving force transmission mechanism is made of: a rack that is elastically deformable; and pinions. A height H1 of a respective one of gear portions at each end part of the rack is greater in comparison with a height H2 of a respective one of gear portions at an intermediate part of the rack. As a result, the present invention is capable of maintaining a load between the rack and a respective one of the pinions at its required minimum level, and is capable of maintaining positional precision in stop location of the movable reflectors at high precision.