coupled to front and rear supports 160 and 170 respectively an inlet duct 180 provided in rear of the drum and an outlet duct 190 is provided in front of the drum whereby the drum can be externally ventilated the inlet and outlet ducts 180 and 190 are coupled to upper and lower parts of the drum respectively a motor 200 is provided under the drum to generate a rotational force in order to transfer the rotational force generated from the motor 200 to the drum a pulley 210 is coupled to one side of the motor 200 and the pulley 210 is connected to the drum via belt 220 a blower fan 230 is connected to the other side of the motor 200 the blower fan 230 is connected to the outlet duct 190 to suck the air inside the drum to discharge outside the case 110 a heater 240 is provided under the drum to dry the laundry held within the drum the heater 240 heats air to supply the heated air to the drum the heater 240 is provided within a heater case 250 in order for the heater 240 to heat the air one side of the heater case 250 is open and the other side of the heater case 250 is connected to the inlet.