According to the invention is operably linked to interlocked by the universal joint the lower end of the steering shaft 10 to the steering gear which is connected to drivingly rotate the front wheel is, a normal heart the steering wheel 20 is coupled to the steering shaft upper end , wherein the steering shaft peripheral surface a power steering device 30 by the motor is rotated in the gear and reverse, and the device, and steering angle sensor 40 for detecting the rotational angle of the wheel according to the rotation angle of the teeth and the device, the steering angle drive where the steering controller 60, which calculates a detection signal of a speed sensor 50 for detecting a running speed of the sensor and the vehicle outputs a control signal connected controllably to a drive motor 70 for rotationally driving the wheels to ensure that controllably connected to the motor controller 80 and the power steering apparatus, steering angle speed while driving the sensor according to the operation angle of the steering wheel 20 to be detected by the sensor 40 (50 ) When the driving detecting speed is above a predetermined, and the steering controller 60 outputs a brake signal to the power steering device 30 and the drive motor controller 80 and to heavy, the operation of the steering wheel 20 at the same time the drive motor of the Since the rotation of 70, so that the automatic deceleration with a speed rotation inhibiting device of the electric vehicle to prevent the vehicle is overturned by inertia.