To provide a vehicular lighting fixture capable of variously adjusting illuminance distribution at vehicle periphery by speedily switching a quantity of the light of a semiconductor light source by a simple constitution.

In a vehicular headlamp 1, a scanning actuator 4 for driving a mirror 3, a light source unit 5 with an LED as a light source and a control circuit 6 are arranged in a housing 2. The light of the LED is reflected to a vehicle front by the mirror 3, and the mirror 3 is reciprocally rotated by the scanning actuator 4, and a light distribution pattern is formed in an illumination area by the periodic motion of the mirror 3. A light source control part is arranged in the control circuit 6, and the turn-on/-off of the LED is controlled by a plurality of the light dimming sections for dividing a motion period of the mirror 3. The on/off-control of the LED is combined with the periodic motion of the mirror 3, and the illuminance distribution of the vehicle front is variously adjusted.