To provide a washing/drying machine capable of drying laundry with high efficiency without resort to a dehumidifying means.

A washing/drying machine 1 comprises: an outer casing 10; a water tub 20 accommodated in the outer casing 10; a dewatering tub 30 accommodated in the water tub 20; an air blower 50 for blowing air into the dewatering tub 30 through a blowing duct 51; a heater 54 for heating the air blown by the air blower 50; an exhaust duct 53; a reflux duct 52 connecting the inside of the dewatering tub 30 to an air inflow section of the air blower 50; and an air channel switching mechanism 60 provided to the air inflow section of the air blower. A control part 70 performs the drying operation in the inside air circulation mode that allows the air blower 50 to flow the air only from the reflux duct 52 as well as the drying operation in the mixed circulation mode that allows the air blower 50 to flow the air from both the reflex duct 52 and an outside air introduction duct 57. The blowing duct 51 is provided with a louver 65 for automatically changing the blowing direction, or a branched nozzle 66.