Vehicular headlight

A vehicular headlight comprising:

• a first light source unit including a plurality of light-emitting elements, the plurality of light-emitting elements being arranged such that irradiation regions of first light emitted forward from the plurality of light-emitting elements are arranged in a matrix shape;
• a second light source unit that emits second light;
• and
• a control unit, wherein
• a light distribution pattern of a low-beam is formed by a first light distribution pattern formed by at least a part of the first light and a second light distribution pattern formed by the second light,
• the light distribution pattern of the low-beam includes a first region in which a part of the first light distribution pattern overlaps a part of the second light distribution pattern, and a second region in which another part of the first light distribution pattern does not overlap the second light distribution pattern and which is continuous with the first region and located above the first region,
• the control unit performs low-beam temperature derating on the first light source unit based on the temperature of the first light source unit in a state where the light distribution pattern of the low-beam is formed by controlling a power to be supplied to each of the plurality of light-emitting elements so that a light amount of at least a part of the first light with which at least the first region is irradiated in the first light distribution pattern decreases as compared with the light amount of the at least a part of the first light before the temperature derating, and the light amount of the at least the part of the first light with which the first region is irradiated decreases more than the light amount of the at least a part of the first light with which the second region is irradiated.