The present invention provides a hybrid compressor system in which its configuration is simplified, its cost and size are reduced, and its reliability is enhanced. In the hybrid compressor system which selectively transmits a driving force of an engine and a driving force of a motor being mounted on a vehicle to a compressor of a vehicle air conditioning device to drive the compressor, the motor is provided with a one-way clutch which selectively transmits the driving force of the motor to the compressor 1.