In light that is irradiated from a front light of a vehicle illumination device, a portion thereof is modulated to include a light signal, and a camera captures light from the front of the vehicle. The vehicle illumination device identifies luminance point(s) in the captured images of the camera, and also detects for the light signal, and extracts the luminance point(s) in the captured images other than the luminance point(s) with the detected light signal. The vehicle illumination device identifies segmented region(s) in the light distribution range of the front light that correspond to the extracted luminance point(s), and control is undertaken of the light distribution such that the identified segmented regions are made in a non-illuminating state, and the segmented regions other than those identified are illuminated. By doing so, control of the light distribution for light that is irradiated from the vehicle itself may be prevented.