A washing machine is disclosed, which prevents bubbles in the drum from leaking outside when an auxiliary door is opened during a washing process. The washing machine includes a cabinet including a first opening, a tub disposed in the cabinet and configured to store wash water therein, a drum rotatably disposed in the tub, a door assembly mounted to the cabinet to open or close the first opening, and including a second opening, an auxiliary door configured to open or close the second opening, and an interference part located at a rear of the auxiliary door to form a predetermined space in the rear part of the auxiliary door.