A washing machine, comprising: a cabinet; a tub provided in the cabinet, the tub having an inlet opening and a discharge opening formed therein; a drum provided in the tub; an air circulating device, comprising: an air collection pipe in communication with the tub, an air delivery pipe in communication with the tub, a circulating duct having a first end thereof connected via the air collection pipe to the inlet opening and a second end thereof connected via the air delivery pipe to the discharge opening so as to circulate air through the tub; a circulating fan provided to introduce the air from the inside of the tub to the circulating duct through the air collection pipe; and a heater provided in the circulating duct to heat air flowing through the circulating duct; and an air discharge device in communication with the tub, wherein the air discharge device is configured to discharge a portion of the air from the inside of the tub to an outside of the tub; characterized by the air discharge device including: a discharge duct for discharging air from inside the tub, the discharge duct passing through an outer circumferential surface of the tub and being spaced apart from the air collection pipe at a predetermined distance, so that a portion of air having undergone heat exchange with laundry is discharged before being collected in the air collection pipe, a connection member passing through the cabinet; an air exhaust pipe connected to between the discharge duct and the connection member, and a discharge pipe connected to the connection member for discharging air from the air exhaust pipe to the outside of the washing machine, wherein the discharge pipe is connected to a drain hose for draining washing water from the inside of the tub during washing or rinsing. a cabinet; a tub provided in the cabinet, the tub having an inlet opening and a discharge opening formed therein; a drum provided in the tub; an air circulating device, comprising: an air collection pipe in communication with the tub, an air delivery pipe in communication with the tub, a circulating duct having a first end thereof connected via the air collection pipe to the inlet opening and a second end thereof connected via the air delivery pipe to the discharge opening so as to circulate air through the tub; a circulating fan provided to introduce the air from the inside of the tub to the circulating duct through the air collection pipe; and a heater provided in the circulating duct to heat air flowing through the circulating duct; and an air discharge device in communication with the tub, wherein the air discharge device is configured to discharge a portion of the air from the inside of the tub to an outside of the tub; an air collection pipe in communication with the tub, an air delivery pipe in communication with the tub, a circulating duct having a first end thereof connected via the air collection pipe to the inlet opening and a second end thereof connected via the air delivery pipe to the discharge opening so as to circulate air through the tub; a circulating fan provided to introduce the air from the inside of the tub to the circulating duct through the air collection pipe; and a heater provided in the circulating duct to heat air flowing through the circulating duct; and an air discharge device in communication with the tub, wherein the air discharge device is configured to discharge a portion of the air from the inside of the tub to an outside of the tub; a discharge duct for discharging air from inside the tub, the discharge duct passing through an outer circumferential surface of the tub and being spaced apart from the air collection pipe at a predetermined distance, so that a portion of air having undergone heat exchange with laundry is discharged before being collected in the air collection pipe, a connection member passing through the cabinet; an air exhaust pipe connected to between the discharge duct and the connection member, and a discharge pipe connected to the connection member for discharging air from the air exhaust pipe to the outside of the washing machine, wherein the discharge pipe is connected to a drain hose for draining washing water from the inside of the tub during washing or rinsing.