Provided is a washing machine including a main body having a first inlet, a drum arranged inside the main body to accommodate laundry, and a door configured to open and close the first inlet, wherein the door includes a second inlet to allow laundry to be introduced into the drum while the first inlet closed, an auxiliary door configured to open and close the second inlet, and a restraining device configured to restrain the auxiliary door such that the auxiliary door remains locked onto the door, and the main body includes a pressing device arranged inside the main body and configured to press the restraining device such that the restraining device locks the auxiliary door and to release from the retraining device such that the restraining device unlocks the auxiliary door.