At t1, a driver requests starting by turning the brake off and opening the accelerator to APO > 0. Below, the case is explained of when target drive torque exceeds the gradient load at t2. Before t2, when the target drive torque is less than or equal to the gradient load, in order to avoid excess current being supplied to the motor, the upper limit of motor speed tNm, which is the input speed of a second clutch, is maximally set to a value smaller than a slip detectable limit value [omega]LLIM at which it becomes possible to detect slip rotation, i.e. the value that is the difference between the output-side rotation speed No. After t2 when the target drive torque exceeds the gradient load, the input speed of the second clutch (the motor speed tNm) is minimally set to a value greater than or equal to [omega]LLIM, and the required drive force can be realized by means of gradient load supporting drive force control on the basis of the detectable slip speed.