DRIVING SUPPORT CONTROL DEVICE OF VEHICLE, DRIVING SUPPORT SYSTEM OF VEHICLE, AND DRIVING SUPPORT CONTROL METHOD OF VEHICLE

A driving support control device of a vehicle is provided including an acquiring unit configured to acquire a traveling state of the vehicle which is detected and a traveling environment of the vehicle, and a control unit, configured to, in a case where zero-point learning of a yaw rate sensor has not been completed, cause a driving support unit to execute collision avoidance support using a reduced operational area reduced from a reference operational area which becomes a reference in view of an error of the yaw rate sensor as an operational area of collision avoidance support, and the traveling state of the vehicle and the traveling environment of the vehicle.