A light distribution control apparatus controls formation of a light distribution pattern by a variable light distribution lamp by using an image based on an imaging apparatus that images an area in front of a vehicle. When changing an illuminance in a first illuminance region equal to or below a predetermined first illuminance threshold value, the light distribution control apparatus changes the illuminance by a first amount of change smaller than an amount of change for changing the illuminance in an illuminance region above the first illuminance threshold value.