To prevent generation of discrepant feeling and deterioration of speed change feeling in the case of speed change of a stepped speed change gear.

When it is judged by a speed change command judging means 120 that a speed change command is outputted, addition torque TAB is calculated by an addition torque calculating means 122, from a previously stored relation, on the basis of an actual rotational speed Nm of a first motor generator 14. By an addition torque outputting means 124, the addition torque TAB calculated by the addition torque calculating means 122 is applied to the first motor generator 14. Thereby rotation synchronization action of rotation synchronizing equipment of an engaging clutch is made smooth approximately to the case of no-load running. The time until rotation synchronization, i.e., the speed change time in the stepped speed change gear, becomes almost constant, so that generation of discrepant feeling and deterioration of speed change feeling can be effectively prevented in the case of speed change.