G-Vectoring Control (GVC) which controls longitudinal acceleration in coordination with lateral motion has been installed in an experimental vehicle that can adjust the anti-dive mechanism. Only the pitch motions characteristics of the vehicle body were changed during lane changes, and the vehicle planar motion characteristics itself are kept unchanged. Drivers’ steering model parameters during lane change for the vehicle with/without GVC are identified. Then, the handling quality evaluations by the drivers are compared and analyzed by using the driver parameters identified and the influence of the vehicle body motion on GVC effect is investigated. It is found as a result of the study that the nose-dive pitch motion caused by the control is important for GVC to be effective in improving the vehicle handling quality.