Vehicular headlamp apparatus

To provide a vehicular headlamp apparatus (210) that is able to form a high-quality light distribution pattern white maintaining a simple structure inside a lamp unit (10) when the vehicle headlamp apparatus (210) includes a rotary drive type cylindrical shade (12), there is provided a bulb (14) that is able to irradiate light forward of a vehicle through a projection lens (20), a rotary shade (12) that is able to form a plurality of types of light distribution patterns using the light from the bulb (14) and that selectively forms any one of the plurality of light distribution patterns in accordance with a rotated state when the rotary shade (12) is driven for rotation, a drive actuator (24) that drives the rotary shade (12) for rotation, and an auxiliary shade (32) that is able to move in accordance with the rotated state of the rotary shade (12) and that moves to a position to block light from a side of the bulb (14), the light not participating in formation of the light distribution pattern selected through operation of the rotary shade (12).