The lateral motion control apparatus calculates lateral motion control amounts for a plurality of control targets that operate cooperatively in order to change the lateral motion amount of the vehicle based on a target value for the lateral motion amount of the vehicle, and control the plurality of control targets based on the calculated lateral motion control amounts. Meanwhile, it is determined whether or not the control of the plurality of control targets is to be stopped. When it has been determined that the control of the plurality of control targets is to be stopped, lateral motion degeneration control amounts are determined for each of the plurality of control targets so that the lateral motion control amounts of the plurality of control targets degenerate starting at that time, and the plurality of control targets are controlled based on the determined lateral motion degeneration control amounts.