means 9 fitted to a bottom of the outer tub 3 in the meantime there is a water supply valve 10 in an upper part of the case 1 for supplying water for washing and rinsing to which a water supply duct not shown for supplying water to the inner tub 5 is connected there is a drain duct 11 connected to an underside of the outer tub 3 for draining dirty water to an outside of the washing machine after washing is finished there is a drain valve 13 fitted to the drain duct 11 an unexplained reference symbol 1 a denotes a washing machine cover there is a circulation duct 20 between an upper part and a lower part of the outer tub 3 for supplying heated air into the inner tub 5 for drying laundry of course there are a heater 15 for heating air and a blower 22 for forced circulation of the air fitted to the circulation duct 20 in the meantime there is a closable inner cover 3 an air tightly fitted to a top of the outer tub 3 for prevention of air leakage it is preferable that a fore end of the circulation duct 20 is connected to the inner cover 3 a and a lower end of the circulation duct 20 is connected to a.