To reduce the engagement time of a front clutch when a new speed change command is recognized during synchronization of the front clutch.

If a disconnected front clutch is engaged, when synchronizing a rotational speed of an input member with a rotational speed of an output member by rotational controlling a rotational speed Ne of an engine, a first speed change command to change a shift stage of an automatic transmission is outputted, and if the shift stage change according to the first speed change command is not completed in the automatic transmission and a second speed change command to change a shift stage of the automatic transmission is recognized, rotational speed synchronization means controls the rotational speed Ne of the engine so that the rotational speed of the input member becomes the rotational speed of the output member in the state the shift stage of the automatic transmission is changed according to the recognized second speed change command.