To provide a washing/drying machine that can dry laundry with high efficiency without relying on dehumidifying means and that can achieve streamlined assembly operation.

A washing/drying machine 1 comprises: an outer casing 10; a water tub 20 housed in the outer casing 10; a dewatering tub 30 housed in the water tub 20; an blower 50 that blows air into the dewatering tub 30 through a blowing duct 51; and a heater 53 that heats the air blown by the blower 50. The air supply into the blower 50 and discharge of the air from the dewatering tub 30 to the outside of the machine are performed via one duct unit 60. The duct unit 60 comprises: an air intake duct 61 that connects the space between the outer casing 10 and the water tub 20 to the air inflow portion of the blower 50; and an exhaust air duct 62 that connects the space in the dewatering tub 30 to the outside of the machine. A heat exchange part 67 is formed between the air intake duct 61 and the exhaust air duct 62.