A washing machine including a casing provided with an opening for introducing laundry into the washing machine; a tub supportably installed in the casing; a drum rotatably located in the tub; driving means for rotating the drum; and a door installed at the casing for opening and closing the opening of the casing, and provided with air suction ports for drawing external air into the drum. The washing machine dries a small quantity of the laundry without application of any additional drying pipe or heater.