A vehicle turn control apparatus has an electronic control unit including a control start/end determination section (80) in which two threshold values associated with the start timing of yaw moment control in the understeer and oversteer modes respectively. The determination section (80) outputs a control beginning flag (Fymc=1) when the absolute value of required moment (.gamma. d) exceeds the absolute value of either threshold value. By providing such a control start condition, smooth yaw moment control can be achieved. Also, by setting the absolute value of threshold value in the oversteer mode at a value smaller than the absolute value of threshold value in the understeer mode, the yaw moment control in the oversteer mode is started at early timing. A restoration moment is quickly produced on the vehicle in the oversteer mode, thereby preventing spinning of the vehicle.