Electric power steering device, and controller-integrated electric motor

Reliable, compact high output, to provide a low-cost electric power steering device and a control device integral motor. A motor driving circuit is constituted by a plurality of power device comprising a semiconductor for controlling the power supplied to the armature winding of the motor, a switch device for opening and closing between the input terminal and the external power supply of the motor drive circuit , and a switch device for opening and closing the armature winding, wherein at least one of the two switch devices is constituted by a semiconductor switch device, the said power element and the semiconductor switching element, is mounted in a metal casing It has a configuration which is mounted on the substrate.