Rack driven power steering device

A rack-driven power steering device prevents a ball nut and a nut pulley due to a slip idling thereof, and it increases a durability, if the drive belt by the driving of a motor (electric motor) is actuated, and minimized vibration and noise caused by the rack bar, the ball nut and the nut pulley to be transmitted, when the rack bar is slid while the nut pulley and the ball nut to rotate, thereby providing a comfortable steering feeling provided to the driver.