A washing machine includes: a case defining a receiving space and an open surface, a drawer provided in the case and configured to slide out through the open surface of the case, the drawer being configured to perform at least one of a washing operation, a rinsing operation, a spin-drying operation, or an air-drying operation for laundry, and a locking device configured to limit a sliding motion of the drawer relative to the case. The locking device includes: a holder provided on an inner wall surface of the case, a lever provided in the drawer and configured to be inserted into the holder, and an elastic member provided in a portion of the holder to which the lever is inserted and configured to come into contact with the lever in a space between the holder and the lever.