A light distribution control system for controlling the light distribution of an automotive headlamp, the system comprising: left and right automotive headlamps capable of controlling a range of illumination in a front area of a vehicle provided with the system; a detection means configured to detect a forward vehicle, based on an image capturing the front area of the vehicle provided with the system; and a control means configured to control the illumination ranges of the left and right automotive headlamp in a manner such that the illumination of the automotive headlamp toward the forward vehicle detected by the detection means is suppressed and the illumination is applied around the forward vehicle, wherein the control means is configured to move both the illumination range of the left automotive headlamp and the illumination range of the right automotive headlamp in a manner such that the size of the horizontally bilateral spaces between the forward vehicle and the illumination range varies according to a position of the forward vehicle in the horizontal direction, and characterized in that the size of each of the horizontal spaces is expressed by a respective angle, each formed by a line extending from the vehicle provided with the system to a respective side surface of the forward vehicle and a line extending from the vehicle provided with the system to a boundary between the respective horizontal space and the illumination range, and wherein the control means is configured to move both the illumination range of the left automotive headlamp and the illumination range of the right automotive headlamp in a manner such that the size of the horizontally bilateral spaces becomes progressively larger as the position of the forward vehicle in the horizon direction shifts outward in a vehicle width direction from a middle position in the vehicle width direction. left and right automotive headlamps capable of controlling a range of illumination in a front area of a vehicle provided with the system; a detection means configured to detect a forward vehicle, based on an image capturing the front area of the vehicle provided with the system; and a control means configured to control the illumination ranges of the left and right automotive headlamp in a manner such that the illumination of the automotive headlamp toward the forward vehicle detected by the detection means is suppressed and the illumination is applied around the forward vehicle, wherein the control means is configured to move both the illumination range of the left automotive headlamp and the illumination range of the right automotive headlamp in a manner such that the size of the horizontally bilateral spaces between the forward vehicle and the illumination range varies according to a position of the forward vehicle in the horizontal direction, and characterized in that the size of each of the horizontal spaces is expressed by a respective angle, each formed by a line extending from the vehicle provided with the system to a respective side surface of the forward vehicle and a line extending from the vehicle provided with the system to a boundary between the respective horizontal space and the illumination range, and wherein the control means is configured to move both the illumination range of the left automotive headlamp and the illumination range of the right automotive headlamp in a manner such that the size of the horizontally bilateral spaces becomes progressively larger as the position of the forward vehicle in the horizon direction shifts outward in a vehicle width direction from a middle position in the vehicle width direction.