A vehicle collision avoidance support apparatus includes a state determination unit configured to determine whether or not there is a state where a moving object proceeding in a direction intersecting with a traveling direction of a vehicle may exist; a first sensor configured to detect an object in front of the vehicle; and an avoidance operation control unit configured to cause the vehicle to perform a predetermined avoidance operation for avoiding a collision according to a detection result of the first sensor within a determination region in front of the vehicle. The avoidance operation control unit uses a region that is wider in a direction perpendicular and horizontal to the travelling direction as the determination region when it is determined that there is a state where the moving object may exist in comparison with when it is determined that there is no state where the moving object may exist.