CONTROLLING DEVICE FOR VEHICLE HEADLIGHT, VEHICLE HEADLIGHT, AND METHOD OF CONTROLLING VEHICLE HEADLIGHT

A controlling device for a vehicle headlight that controls a light distribution state by the vehicle headlight, includes a shielding range derivation part that obtains movement information that is information showing movement of an oncoming vehicle and that derives a shielding range of the vehicle headlight on the basis of the obtained movement information, and a light distribution controller that controls the light distribution state of the vehicle headlight according to the shielding range derived by the shielding range derivation part.