A headlamp includes a sub-reflector between a main reflector and a projection lens. The sub-reflector has a sub-reflection surface in a form of a paraboloid of revolution. The sub-reflector is movable between a low-beam posture and a high-beam posture. The sub-reflector forms a diffused light distribution pattern superposes the pattern on a low-beam light distribution pattern produced by the main reflector when the sub-reflector is in the low-beam posture and forms a condensed light distribution pattern and superposes the pattern on a high-beam light distribution pattern formed by the main reflector when the sub-reflector is in the high-beam posture.