A motor drive control device for electric power steering (A-F), that is for driving and controlling a motor used in an electric power steering system, the motor drive control device comprising: a switching element that supplies a current to the motor ; one or more coil (s) ; one or more smoothing capacitor (s) ; an electrical connection member that electrically connects the switching element with the smoothing capacitor(s) and with the coil(s) ; a control board that mounts a control element; a control signal line that electrically connects the switching element with the control board ; and characterized by a switching element placing portion on which the switching element is placed; wherein the electrical connection member is arranged between the switching element and the control board , and at least one of the smoothing capacitor (s) and at least one of the coil (s) are arranged, with respect to the electrical connection member , on a side where the switching element is placed, and wherein end surfaces of the smoothing capacitor(s) and the coil(s) arranged on the side where the switching element is placed, are positioned, with respect to the electrical connection member , apart from a plane where the switching element and the switching element placing portion are adjoined together, which is integrated with and connected electrically and mechanically to the motor , to be arranged on an end portion of the motor in a rotation shaft direction thereof and on a side opposite to where a deceleration mechanism for reducing a speed of the motor is provided, and includes a heat sink which is formed as integrated with, or independent of, the switching element placing portion , wherein said switching element is placed for each of different phases, and the switching elements and a power relay for shutting off a current flowing from a battery into the motor drive control device for electric power steering(D), are arranged approximately at concyclic positions. a switching element that supplies a current to the motor ; one or more coil (s) ; one or more smoothing capacitor (s) ; an electrical connection member that electrically connects the switching element with the smoothing capacitor(s) and with the coil(s) ; a control board that mounts a control element; a control signal line that electrically connects the switching element with the control board ; and characterized by a switching element placing portion on which the switching element is placed; wherein the electrical connection member is arranged between the switching element and the control board , and at least one of the smoothing capacitor (s) and at least one of the coil (s) are arranged, with respect to the electrical connection member , on a side where the switching element is placed, and wherein end surfaces of the smoothing capacitor(s) and the coil(s) arranged on the side where the switching element is placed, are positioned, with respect to the electrical connection member , apart from a plane where the switching element and the switching element placing portion are adjoined together, which is integrated with and connected electrically and mechanically to the motor , to be arranged on an end portion of the motor in a rotation shaft direction thereof and on a side opposite to where a deceleration mechanism for reducing a speed of the motor is provided, and includes a heat sink which is formed as integrated with, or independent of, the switching element placing portion , wherein said switching element is placed for each of different phases, and the switching elements and a power relay for shutting off a current flowing from a battery into the motor drive control device for electric power steering(D), are arranged approximately at concyclic positions. <EOS>