Vehicular headlamp

[TASK] To prevent generation of glare light, and the like by attaining an optimal radiation state according to the circumstances without increasing manufacturing cost. [MEANS OF SOLVING THE PROBLEM] A lamp unit 6 is disposed inside a lamp outer casing 4 formed by a cover 3 and a lamp housin 2. The lamp unit is provided with a light source 7 for emitting light, a reflector 11 for reflecting, in a forward direction, light emitted from the light source, a projection lens 8 for projecting the light emitted from the light source to radiate the light in the forward direction, and a reflective body 12 that has a pair of reflective surfaces 12a, 12a facing substantially a lateral direction, is located between the light source and the projection lens, and is movable in the lateral direction.