1. A vehicle braking/driving force control apparatus comprising: braking/driving force applying device configured to apply braking/driving forces to wheels; means for detecting an amount of driving operation by an occupant; means for calculating a vehicle target braking/driving force and a vehicle target yaw moment, generated by the braking/driving forces of the wheels, on the basis of at least the amount of the driving operation by the occupant; modifying means for modifying said target braking/driving force and/or said target yaw moment, when said target braking/driving force and/or said target yaw moment cannot be achieved by the braking/driving forces of the wheels; and control means for controlling the braking/driving force applied to each wheel by said braking/driving force applying device such that the vehicle braking/driving force and a yaw moment by the braking/driving forces of the wheels become said target braking/driving force after the modification and said target yaw moment after the modification, wherein said modifying means modifies said target braking/driving force and/or said target yaw moment to values, in a rectangular coordinate in which the vehicle braking/driving force and the yaw moment are defined as coordinate axes, that are (1) within a range of the vehicle braking/driving force and the vehicle yaw moment attainable by the braking/driving forces of the wheels and (2) within an ellipse which has its center on the coordinate axis of the vehicle braking/driving force of said rectangular coordinate and has a major axis and minor axis aligning with the directions of the coordinate axes of said rectangular coordinate.