HEADLIGHT DEVICE

A headlight device is a headlight device for a vehicle, including a light source unit to include a plurality of light-emitting units respectively emitting light having spectral distributions different from each other and to emit illuminating light having a combined spectral distribution as a combination of the spectral distributions of the plurality of light-emitting units, an acquisition unit to acquire environment information indicating a surrounding environment around an illumination region formed by the headlight device, and a control unit to control the spectral distributions of the plurality of light-emitting units based on the environment information acquired by the acquisition unit.