Light distribution control device, vehicular lamp system, and light distribution control method

A light distribution control device that controls formation of a light distribution pattern by a light distribution variable lamp capable of illuminating a region ahead of a vehicle with a visible light beam of a variable intensity distribution, wherein

• the light distribution control device controls the light distribution variable lamp so as to, if a driver of the vehicle has indicated his or her intention to move the vehicle into a road of two or more roads which a forked road branches into, while the light distribution control device is provided with information concerning the road of the two or more roads which the forked road branches into and while a normal light distribution pattern is formed that includes, in an illumination range thereof, a side illuminating the road of the two or more roads which the forked road branches into and a side illuminating an other road of the two or more roads which the forked road branches into, form a guiding light distribution pattern which illuminates at least one of a first road surface at the entrance of the road of the two or more roads that the forked road branches into or a region extending vertically above the first road surface more brightly than a second road surface at the entrance of the other road of the two or more roads that the forked road branches into and a region extending vertically above the second road surface.