A clothes treating apparatus comprising: a case; a drum installed within the case and configured to accommodate an item for drying; a circulation duct configured to form an air circulation flow channel that allows air to circulate through the drum; a heat pump cycle including an evaporator and a condenser disposed to be spaced apart from one another within the circulation duct, the heat pump cycle being configured to absorb heat of air released from the drum through the evaporator and transmit the absorbed heat to air introduced to the drum through the condenser, by using a working fluid that circulates by way of the evaporator and the condenser; and a dehumidification device (150, 250, 350, 450) provided to dehumidify air passing through the evaporator in the circulation duct, characterized in that the dehumidification device (150, 250, 350) includes: a first water cooling type heat exchanger (151, 251, 351) and a second water cooling type heat exchanger (152, 252, 352) installed within the circulation duct, the first water cooling type heat exchanger (151, 251, 351) being disposed upstream relative to the evaporator and the second water cooling type heat exchanger (152, 252, 352) being disposed downstream relative to the evaporator with respect to a direction of airflow through the evaporator; a water supply device (153, 253, 353) configured to supply water to the first water cooling type heat exchanger (151, 251, 351) and the second water cooling type heat exchanger (152, 252, 352). a case; a drum installed within the case and configured to accommodate an item for drying; a circulation duct configured to form an air circulation flow channel that allows air to circulate through the drum; a heat pump cycle including an evaporator and a condenser disposed to be spaced apart from one another within the circulation duct, the heat pump cycle being configured to absorb heat of air released from the drum through the evaporator and transmit the absorbed heat to air introduced to the drum through the condenser, by using a working fluid that circulates by way of the evaporator and the condenser; and a dehumidification device (150, 250, 350, 450) provided to dehumidify air passing through the evaporator in the circulation duct, characterized in that the dehumidification device (150, 250, 350) includes: a first water cooling type heat exchanger (151, 251, 351) and a second water cooling type heat exchanger (152, 252, 352) installed within the circulation duct, the first water cooling type heat exchanger (151, 251, 351) being disposed upstream relative to the evaporator and the second water cooling type heat exchanger (152, 252, 352) being disposed downstream relative to the evaporator with respect to a direction of airflow through the evaporator; a water supply device (153, 253, 353) configured to supply water to the first water cooling type heat exchanger (151, 251, 351) and the second water cooling type heat exchanger (152, 252, 352). a first water cooling type heat exchanger (151, 251, 351) and a second water cooling type heat exchanger (152, 252, 352) installed within the circulation duct, the first water cooling type heat exchanger (151, 251, 351) being disposed upstream relative to the evaporator and the second water cooling type heat exchanger (152, 252, 352) being disposed downstream relative to the evaporator with respect to a direction of airflow through the evaporator; a water supply device (153, 253, 353) configured to supply water to the first water cooling type heat exchanger (151, 251, 351) and the second water cooling type heat exchanger (152, 252, 352).