Provided is a clothes treating apparatus which may include a cabinet defining an outer appearance of the apparatus and having an introduction opening, a clothes receiving device provided in the cabinet and receiving therein clothes through the introduction opening, a circulation passage through which internal air of the clothes receiving device circulates, a heat-exchanging passage connected to the circulation passage to guide external air outside the circulation passage into the circulation passage for heat exchange with the internal air of the circulation passage, and a fan provided at the heat-exchanging passage to generate airflow in the heat-exchanging passage.