A clothes treating apparatus, characterized by comprising: a cabinet defining appearance of the apparatus and having an introduction opening; a clothes receiving unit provided in the cabinet and receiving therein clothes through the introduction opening; a circulation passage (51, 53, 55) through which internal air of the clothes receiving unit circulates; a heat-exchanging unit provided in the circulation passage (51, 53, 55); a compressor connected to the heat-exchanging unit to compress a refrigerant; a first fan configured to supply external air of the circulation passage (51, 53, 55) into the circulation passage (51, 53, 55) for heat exchange between the external air and internal air of the circulation passage (51, 53, 55); and a heat-exchanging passage through which the first fan and the circulation passage (51, 53, 55) are connected to each other, wherein the heat-exchanging passage comprises: a first heat-exchanging duct having one end open toward an outside of the circulation passage (51, 53, 55) and another end connected to the circulation passage (51, 53, 55), such that the external air of the circulation passage (51, 53, 55) is introduced therethrough; and a second heat-exchanging duct having one end connected to the circulation passage (51, 53, 55) and another end connected to the first fan, such that the internal air of the circulation passage (51, 53, 55) is discharged therethrough, characterized in that the clothes treating apparatus further comprises an inner air hole defined between the first heat-exchanging duct and the second heat-exchanging duct through which the first heat-exchanging duct and the second heat-exchanging duct communicate, and an opening/closing unit comprising an opening/closing member rotatably provided in the inner air hole for opening and closing the first heat-exchanging duct and the second heat-exchanging duct in a simultaneous manner, wherein the inner air hole is closed when the first heat-exchanging duct and the second heat-exchanging duct are open by rotation of the opening/closing member, and opened when the first heat-exchanging duct and the second heat-exchanging duct are closed. a cabinet defining appearance of the apparatus and having an introduction opening; a clothes receiving unit provided in the cabinet and receiving therein clothes through the introduction opening; a circulation passage (51, 53, 55) through which internal air of the clothes receiving unit circulates; a heat-exchanging unit provided in the circulation passage (51, 53, 55); a compressor connected to the heat-exchanging unit to compress a refrigerant; a first fan configured to supply external air of the circulation passage (51, 53, 55) into the circulation passage (51, 53, 55) for heat exchange between the external air and internal air of the circulation passage (51, 53, 55); and a heat-exchanging passage through which the first fan and the circulation passage (51, 53, 55) are connected to each other, wherein the heat-exchanging passage comprises: a first heat-exchanging duct having one end open toward an outside of the circulation passage (51, 53, 55) and another end connected to the circulation passage (51, 53, 55), such that the external air of the circulation passage (51, 53, 55) is introduced therethrough; and a second heat-exchanging duct having one end connected to the circulation passage (51, 53, 55) and another end connected to the first fan, such that the internal air of the circulation passage (51, 53, 55) is discharged therethrough, characterized in that the clothes treating apparatus further comprises an inner air hole defined between the first heat-exchanging duct and the second heat-exchanging duct through which the first heat-exchanging duct and the second heat-exchanging duct communicate, and an opening/closing unit comprising an opening/closing member rotatably provided in the inner air hole for opening and closing the first heat-exchanging duct and the second heat-exchanging duct in a simultaneous manner, wherein the inner air hole is closed when the first heat-exchanging duct and the second heat-exchanging duct are open by rotation of the opening/closing member, and opened when the first heat-exchanging duct and the second heat-exchanging duct are closed. a first heat-exchanging duct having one end open toward an outside of the circulation passage (51, 53, 55) and another end connected to the circulation passage (51, 53, 55), such that the external air of the circulation passage (51, 53, 55) is introduced therethrough; and a second heat-exchanging duct having one end connected to the circulation passage (51, 53, 55) and another end connected to the first fan, such that the internal air of the circulation passage (51, 53, 55) is discharged therethrough, characterized in that the clothes treating apparatus further comprises an inner air hole defined between the first heat-exchanging duct and the second heat-exchanging duct through which the first heat-exchanging duct and the second heat-exchanging duct communicate, and an opening/closing unit comprising an opening/closing member rotatably provided in the inner air hole for opening and closing the first heat-exchanging duct and the second heat-exchanging duct in a simultaneous manner, wherein the inner air hole is closed when the first heat-exchanging duct and the second heat-exchanging duct are open by rotation of the opening/closing member, and opened when the first heat-exchanging duct and the second heat-exchanging duct are closed.