A vehicle light distribution control device, comprising: an illumination device that irradiates illumination light toward a front of a vehicle, that is adapted to be controlled such that a light distribution pattern is changed among a high beam pattern, a low beam pattern formed by a low beam shade and a split beam pattern formed by a one-side high beam shade, and that is adapted to be controlled such that an optical axis direction varies in a substantially horizontal direction to achieve a target swivel angle, which is determined based on a steering angle of a steering wheel of the vehicle and a vehicle speed, with the use of a swivel motor; and a control unit that is configured to control the illumination device, whereby the split beam pattern is arranged such that part of an area in the high beam pattern is shielded by the one-side high beam shade with a boundary set at a cut-off line (CR, CL), the control unit is configured, when a vehicle ahead has been detected, to change the light distribution pattern formed by the illumination device to the split beam pattern, and to control a position of the cut-off line (CR, CL) of the split beam pattern so as not to irradiate the illumination light to the vehicle ahead, the control unit is configured, when the vehicle ahead becomes undetectable, to maintain the split beam pattern while controlling the position of the cut-off line (CR, CL) of the split beam pattern in such a manner that a shielded area of the split beam pattern gradually reduces, and, after the shielded area becomes smaller than or equal to a predetermined reference, the control unit is configured to change the light distribution pattern from the split beam pattern to the high beam pattern, wherein the cut-off line (CR, CL) of the split beam pattern is changed in a direction of the target swivel angle. an illumination device that irradiates illumination light toward a front of a vehicle, that is adapted to be controlled such that a light distribution pattern is changed among a high beam pattern, a low beam pattern formed by a low beam shade and a split beam pattern formed by a one-side high beam shade, and that is adapted to be controlled such that an optical axis direction varies in a substantially horizontal direction to achieve a target swivel angle, which is determined based on a steering angle of a steering wheel of the vehicle and a vehicle speed, with the use of a swivel motor; and a control unit that is configured to control the illumination device, whereby the split beam pattern is arranged such that part of an area in the high beam pattern is shielded by the one-side high beam shade with a boundary set at a cut-off line (CR, CL), the control unit is configured, when a vehicle ahead has been detected, to change the light distribution pattern formed by the illumination device to the split beam pattern, and to control a position of the cut-off line (CR, CL) of the split beam pattern so as not to irradiate the illumination light to the vehicle ahead, the control unit is configured, when the vehicle ahead becomes undetectable, to maintain the split beam pattern while controlling the position of the cut-off line (CR, CL) of the split beam pattern in such a manner that a shielded area of the split beam pattern gradually reduces, and, after the shielded area becomes smaller than or equal to a predetermined reference, the control unit is configured to change the light distribution pattern from the split beam pattern to the high beam pattern, wherein the cut-off line (CR, CL) of the split beam pattern is changed in a direction of the target swivel angle.