Door of drum type washing machine

Disclosed herein is a door of a drum type washing machine. The door comprises a ring-shaped door frame hingedly connected to the front surface of the cabinet at one lateral side thereof, a door glass (56) disposed at an open center of the door frame, a grip casing (60) mounted inside a grip hole (58) formed at the other lateral side of the door frame for preventing the interior of the door frame from being exposed to the outside through the grip hole (58), and a hook assembly (80) disposed at the grip casing (60) for locking the door frame to the front surface of the cabinet at the other lateral side of the door frame. The interiors of the front door frame (54) and the rear door frame (52) are prevented from being exposed to the outside through the grip hole (58) by the grip casing (60), and the hook assembly (80) is easily and conveniently mounted to the door frame.