A control apparatus of a rotary electric machine includes a rotor; a stator including a multiphase stator winding provided with conductor portions arranged in a circumferential direction thereof. The rotary electric machine is configured of any one of a first configuration having a first inter-conductor member using a magnetic material; a second configuration having a second inter-conductor member using a non-magnetic material; and a third configuration having no inter-conductor member. The control apparatus includes: a drive circuit with switching elements provided for each phase, supplying power to the multiphase stator winding; and a control unit controlling the drive circuit such that a period where a conduction ratio of the switching elements for one phase in the drive circuit is maintained at a constant value is more than or equal to 120 degrees and less than 180 degrees in electrical angle.