It is an object to provide a driving apparatus, which can be easily mounted to vehicles of different models. A circuit unit for controlling an operation of an electric motor is fixed to an axial end of a motor casing. A connector holding unit, which is integrally formed with a heat sink of the circuit unit, is composed of a first and a second arm portions and a connecting portion to form a connector accommodating space in such a radial outside position of the motor casing. The connector accommodating space extends in an axial direction of the motor casing. An inside connector unit is inserted into the connector accommodating space. The inside connector unit has a connector-insert hole into which an outside connector (a vehicle-side connector) is inserted for electrical connection.