Door for microwave oven

A microwave oven (10) includes two doors (20,30) which primarily and secondarily prevent a leakage of microwaves from a cooking cavity (11) during a cooking operation. A first door (20) is rotatably hinged to a front wall of a cabinet (10) of the microwave oven, so as to open and close an opening of the cooking cavity (11) and primarily prevent the leakage of the microwaves from the cooking cavity. A second door (30) is rotatably mounted to the cabinet in front of the first door (20) to cover and uncover the front of the first door. The second door thus secondarily intercepts the microwaves which have leaked from the cooking cavity through a gap between the first door and the cabinet. The microwave oven effectively prevents almost all leakage of the microwaves from the cooking cavity during the cooking operation.