Abstract: A washing machine may include a cabinet; a tub inside the cabinet and configured to contain wash water; a drum inside the tub and configured to contain laundry; a water supply device configured to supply the wash water into the tub; a drain configured to discharge the wash water in the tub to the outside; a driving device configured to provide power to the drum; and a control device configured to control the driving device, wherein the driving device includes a driving shaft connected to the drum; a rotor configured to rotate the driving shaft; and a bolt coupled to the driving shaft, the bolt having a head inside the rotor.