A vehicular headlamp including: a lamp unit that includes a unit main body including a light source and a connecting portion arranged at least partially at an outer circumferential side of the unit main body; a leveling actuator that is connected to the connecting portion and that moves the lamp unit to adjust an irradiation direction of light emitted from the light source; and an aiming mechanism that includes a pair of aiming shafts connected to the connecting portion and that moves, through an operation of the aiming shafts, the lamp unit to adjust an irradiation direction of light emitted from the light source, the connecting portion has a leveling operation portion to which the leveling actuator is connected and a pair of aiming operation portions to which the respective the aiming shafts are connected; the pair of the aiming operation portions are arranged spaced from each other in a lateral direction of the vehicular headlamp; and the leveling operation portion is arranged between the pair of the aiming operation portions, on an opposite side of the unit main body from the pair of the aiming shafts, and the leveling operation portion is arranged at a position corresponding to an intermediate position between the pair of the aiming operation portions, on the opposite side of the unit main body from the pair of the aiming shafts, the vehicular headlamp further comprising a lamp housing that constitutes a lamp outer case, characterized in that a regulated portion is provided on a connecting body that constitutes part of the connecting portion, the regulated portion is supported by the lamp housing so as to be movable in a front-rearward direction of the vehicular headlamp and so as to be immovable in the lateral direction of the vehicular headlamp, the regulated portion is arranged at the position corresponding to the intermediate position between the pair of the aiming operation portions, and the leveling actuator is fixed to the lamp housing. a lamp unit that includes a unit main body including a light source and a connecting portion arranged at least partially at an outer circumferential side of the unit main body; a leveling actuator that is connected to the connecting portion and that moves the lamp unit to adjust an irradiation direction of light emitted from the light source; and an aiming mechanism that includes a pair of aiming shafts connected to the connecting portion and that moves, through an operation of the aiming shafts, the lamp unit to adjust an irradiation direction of light emitted from the light source, the connecting portion has a leveling operation portion to which the leveling actuator is connected and a pair of aiming operation portions to which the respective the aiming shafts are connected; the pair of the aiming operation portions are arranged spaced from each other in a lateral direction of the vehicular headlamp; and the leveling operation portion is arranged between the pair of the aiming operation portions, on an opposite side of the unit main body from the pair of the aiming shafts, and the leveling operation portion is arranged at a position corresponding to an intermediate position between the pair of the aiming operation portions, on the opposite side of the unit main body from the pair of the aiming shafts, the vehicular headlamp further comprising a lamp housing that constitutes a lamp outer case, characterized in that a regulated portion is provided on a connecting body that constitutes part of the connecting portion, the regulated portion is supported by the lamp housing so as to be movable in a front-rearward direction of the vehicular headlamp and so as to be immovable in the lateral direction of the vehicular headlamp, the regulated portion is arranged at the position corresponding to the intermediate position between the pair of the aiming operation portions, and the leveling actuator is fixed to the lamp housing.