Each of a plurality of distance sensors is provided adjacent to a corresponding one of a plurality of displaceable portions that are displaced upon application of at least one of a brake force and a drive force to a tire. Each distance sensor measures an amount of displacement of the corresponding displaceable portion upon the application of the at least one of the brake force and the drive force to the tire. An ECU computes a target tire receiving force component based on the amounts of displacement, which are measured with the plurality of displacement measurement sensors, respectively, while eliminating an unnecessary tire receiving force component.