A vehicle motion control system comprising: a control Command value calculation unit configured to calculate a control command value for controlling the longitudinal acceleration of a vehicle; a longitudinal acceleration estimating unit configured to estimate the longitudinal acceleration of the vehicle induced by a driver's brake operation; a longitudinal jerk estimating unit configured to estimate the longitudinal jerk of the vehicle by differentiating the longitudinal acceleration with respect to time; characterized in further comprising: a deviation determination unit configured to determine a deviation between vehicle's motion induced by the driver's brake operation and vehicle's motion induced by a control command using the longitudinal jerk and the control command value; and a control command value correction unit configured to correct the control command in accordance with a deviation determination result of the deviation determination unit, characterized in that when it is determined that the deviation is large as the deviation determination result, the control command value correction unit outputs a control command value which is output in the last routine, and when it is determined that the deviation is small, the control command value correction unit outputs the control command value. a control Command value calculation unit configured to calculate a control command value for controlling the longitudinal acceleration of a vehicle; a longitudinal acceleration estimating unit configured to estimate the longitudinal acceleration of the vehicle induced by a driver's brake operation; a longitudinal jerk estimating unit configured to estimate the longitudinal jerk of the vehicle by differentiating the longitudinal acceleration with respect to time; characterized in further comprising: a deviation determination unit configured to determine a deviation between vehicle's motion induced by the driver's brake operation and vehicle's motion induced by a control command using the longitudinal jerk and the control command value; and a control command value correction unit configured to correct the control command in accordance with a deviation determination result of the deviation determination unit, characterized in that when it is determined that the deviation is large as the deviation determination result, the control command value correction unit outputs a control command value which is output in the last routine, and when it is determined that the deviation is small, the control command value correction unit outputs the control command value. a deviation determination unit configured to determine a deviation between vehicle's motion induced by the driver's brake operation and vehicle's motion induced by a control command using the longitudinal jerk and the control command value; and a control command value correction unit configured to correct the control command in accordance with a deviation determination result of the deviation determination unit, characterized in that when it is determined that the deviation is large as the deviation determination result, the control command value correction unit outputs a control command value which is output in the last routine, and when it is determined that the deviation is small, the control command value correction unit outputs the control command value.