A laundry machine comprising: a cabinet defining an exterior of the laundry machine; a tub provided to the cabinet; a drum rotatably provided in the tub; a suction duct positioned on an outer circumferential surface of a rear portion of the tub to suction air from the tub; a discharge duct positioned at a front of the tub to supply air from the tub; a connection duct positioned between the suction duct and the discharge duct, the connection duct being provided with a heat exchanger (200; 300) for heating of the air; and a circulation fan positioned between the connection duct and the discharge duct to circulate the air, wherein the heat exchanger comprises: an evaporator having evaporation fins (222; 320) and configured to produce condensed water at the evaporation fins (222; 320) by dehumidifying the air; a condenser to heat the air having passed through the evaporator; an expansion valve (230; 330) connecting the condenser to the evaporator, the expansion valve (230; 330) being provided with a capillary tube (232; 332) positioned below the evaporator, and the capillary tube (232; 332) is cooled by the condensed water produced at the evaporation fins (222; 320) which moves down the evaporation fins (222; 320) by gravity and falls onto the capillary tube (232; 332); and a compressor provided to an exterior of the connection duct to circulate a refrigerant along the evaporator, the condenser and the expansion valve (230; 330) through a refrigerant pipe. a cabinet defining an exterior of the laundry machine; a tub provided to the cabinet; a drum rotatably provided in the tub; a suction duct positioned on an outer circumferential surface of a rear portion of the tub to suction air from the tub; a discharge duct positioned at a front of the tub to supply air from the tub; a connection duct positioned between the suction duct and the discharge duct, the connection duct being provided with a heat exchanger (200; 300) for heating of the air; and a circulation fan positioned between the connection duct and the discharge duct to circulate the air, wherein the heat exchanger comprises: an evaporator having evaporation fins (222; 320) and configured to produce condensed water at the evaporation fins (222; 320) by dehumidifying the air; a condenser to heat the air having passed through the evaporator; an expansion valve (230; 330) connecting the condenser to the evaporator, the expansion valve (230; 330) being provided with a capillary tube (232; 332) positioned below the evaporator, and the capillary tube (232; 332) is cooled by the condensed water produced at the evaporation fins (222; 320) which moves down the evaporation fins (222; 320) by gravity and falls onto the capillary tube (232; 332); and a compressor provided to an exterior of the connection duct to circulate a refrigerant along the evaporator, the condenser and the expansion valve (230; 330) through a refrigerant pipe. an evaporator having evaporation fins (222; 320) and configured to produce condensed water at the evaporation fins (222; 320) by dehumidifying the air; a condenser to heat the air having passed through the evaporator; an expansion valve (230; 330) connecting the condenser to the evaporator, the expansion valve (230; 330) being provided with a capillary tube (232; 332) positioned below the evaporator, and the capillary tube (232; 332) is cooled by the condensed water produced at the evaporation fins (222; 320) which moves down the evaporation fins (222; 320) by gravity and falls onto the capillary tube (232; 332); and a compressor provided to an exterior of the connection duct to circulate a refrigerant along the evaporator, the condenser and the expansion valve (230; 330) through a refrigerant pipe.