To use one motor for driving an auxiliary machine and for driving a vehicle, while enabling EV mode without co-rotating an engine.

A driving device of a hybrid vehicle includes: an engine 1; drive motor 2; an auxiliary belt 10; and a power supply/cut-off clutch 8. The drive motor 2 disposed in line with the engine 1 in a radial direction, transmits driving force to tires 12 and 12. The auxiliary belt 10 is connected to the drive motor 2, to connect a plurality of auxiliary devices 4 together. The power supply/cut-off clutch 8 is disposed between the auxiliary belt 10 and the engine 1.