A planetary gear mechanism, a first rotary machine connected to a sun gear of the planetary gear mechanism, an engine and a one-way clutch connected to a carrier of the planetary gear mechanism, a second rotary machine and a drive wheel connected to a ring gear of the planetary gear mechanism, and a parking device connected to the ring gear are provided; the first rotary machine is positively rotated (step S30) and the parking device is disengaged (step S40) when a command to disengage the parking device is received (step S10-Y). It is also possible to positively rotate the first rotary machine and disengage the parking device when the command to disengage the parking device is received on a climbing road (step S20-Y).