A laundry treatment apparatus, comprising: a cabinet having an opening formed therein; a receiving space formed within the cabinet and configured to receive laundry through the opening formed in the cabinet; and at least two doors coupled to the cabinet to selectively open and close the opening formed in the cabinet, the at least two doors including: a first door rotatably coupled to the cabinet, the first door having a first door through-hole corresponding to the opening formed in the cabinet; and a second door rotatably coupled to the first door so as to selectively open and close the first door through-hole; a locking mechanism including: a first door holder configured to secure the first door to the cabinet when the second door is rotated toward an open position relative to the opening in the cabinet; and a second door holder configured to couple the second door to the first door, such that the first and second doors (38, 39) rotate together during rotation of the first door, when the first door is rotated toward an open position relative to the opening in the cabinet, characterized in that the first door holder further comprises: a first holder provided in the cabinet to have a reciprocating movement, the first holder being configured to detachably couple the first door to the cabinet; and a pressure piece provided at the second door and configured to make the first holder move in a direction to be separated from the first door when the second door is rotated toward a closed position relative to the opening in the cabinet, and in that the second door holder is configured to decouple the second door from the first door when the first door is rotated toward a closed position relative to the opening in the cabinet. a cabinet having an opening formed therein; a receiving space formed within the cabinet and configured to receive laundry through the opening formed in the cabinet; and at least two doors coupled to the cabinet to selectively open and close the opening formed in the cabinet, the at least two doors including: a first door rotatably coupled to the cabinet, the first door having a first door through-hole corresponding to the opening formed in the cabinet; and a second door rotatably coupled to the first door so as to selectively open and close the first door through-hole; a first door rotatably coupled to the cabinet, the first door having a first door through-hole corresponding to the opening formed in the cabinet; and a second door rotatably coupled to the first door so as to selectively open and close the first door through-hole; a locking mechanism including: a first door holder configured to secure the first door to the cabinet when the second door is rotated toward an open position relative to the opening in the cabinet; and a second door holder configured to couple the second door to the first door, such that the first and second doors (38, 39) rotate together during rotation of the first door, when the first door is rotated toward an open position relative to the opening in the cabinet, a first door holder configured to secure the first door to the cabinet when the second door is rotated toward an open position relative to the opening in the cabinet; and a second door holder configured to couple the second door to the first door, such that the first and second doors (38, 39) rotate together during rotation of the first door, when the first door is rotated toward an open position relative to the opening in the cabinet, characterized in that the first door holder further comprises: a first holder provided in the cabinet to have a reciprocating movement, the first holder being configured to detachably couple the first door to the cabinet; and a pressure piece provided at the second door and configured to make the first holder move in a direction to be separated from the first door when the second door is rotated toward a closed position relative to the opening in the cabinet, and in that a first holder provided in the cabinet to have a reciprocating movement, the first holder being configured to detachably couple the first door to the cabinet; and a pressure piece provided at the second door and configured to make the first holder move in a direction to be separated from the first door when the second door is rotated toward a closed position relative to the opening in the cabinet, and in that the second door holder is configured to decouple the second door from the first door when the first door is rotated toward a closed position relative to the opening in the cabinet.