To improve the property for water-saving by reducing the consumed amount of cooling water while securing a high drying performance.

In a drying stroke, a control part allows an exhaust temperature sensor to detect an air temperature T1 after exchanging the heat with laundry in a drum and allows a cooling water temperature sensor to detect the temperature T2 of the cooling water after dehumidification. The control part calculates an average temperature Tav of the both temperatures T1 and T2 and, when the value reaches a prescribed upper limit temperature Tu, opens a cooling water valve to start the supply of the cooling water. When the average temperature Tav starts to lower by the cooling water supply and lowers to a lower limit temperature TL, the control part stops the supply of the cooling water. This drier thus controls an intermittent supply of the cooling water using the average temperature Tav, so that even if the exhaust temperature T1 starts to increase with the progress of the drying of the laundry, the temperature of the heated air abutting on the laundry in the drum is prevented from lowering and to prevent the lowering of the drying performance.

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