Patent ID: 8866357

Claim:
A drive device comprising: a motor including a motor case having a cylindrical shape that defines an outer shape of the motor, a stator arranged in the motor case in a radial direction, a winding wire wound around the stator so as to define plural phases, a rotor arranged in the stator in the radial direction, the rotor being rotatable relative to the stator, and a shaft rotated with the rotor; a control unit including a semiconductor module having a switching element which switches electricity supply to the winding wire, a receiving member that receives the semiconductor module, and a board electrically connected with the semiconductor module, wherein the control unit is arranged on a side of the motor in an axis direction of the motor; a first fastener arranged in a wall part of the motor case opposing to the control unit, on an inner side of a peripheral wall of the motor case in the radial direction; and a second fastener tightened with the first fastener so as to connect the motor and the control unit with each other, wherein the receiving member has a leg that contacts the wall part of the motor case, the leg has a through hole extending in the axis direction of the motor, the first fastener is inserted into the through hole of the leg from a side of the motor, and the second fastener is inserted into the through hole of the leg from a side of the control unit.