A laundry treating apparatus comprising: a drum configured to rotate about a rotation axis extending in a front-rear direction; and a lifter (61a, 61b, 62a, 62b, 63a, and 63b) disposed on an inner circumferential surface of the drum and configured to revolve about the rotation axis when the drum rotates, wherein the drum comprises: an opening portion formed by penetrating and opening a part of the drum; and a catching tab (514a, 514b) extending from one surface of a circumference of the opening portion to an opened portion, wherein the lifter (61a, 61b, 62a, 62b, 63a, 63b) comprises: a lifter frame installed on the inner circumferential surface of the drum; and a frame cover coupled to the lifter frame and protruding radially inward from the inner circumferential surface of the drum, wherein the lifter frame comprises: a frame base coupled to the inner circumferential surface of the drum and having a seating groove formed along a circumference of the frame base; a frame upper plate spaced apart from the frame base in a direction toward the inside of the drum; and a frame sidewall configured to connect the frame upper plate and the frame base; characterized by a catching protrusion protruding from an inner surface of the lifter frame and configured to come into contact with the catching tab (514a, 514b) when the lifter frame is coupled to the inner circumferential surface of the drum, and wherein the catching protrusion is formed to be symmetrical based on a center in a plan view of the lifter frame. a drum configured to rotate about a rotation axis extending in a front-rear direction; and a lifter (61a, 61b, 62a, 62b, 63a, and 63b) disposed on an inner circumferential surface of the drum and configured to revolve about the rotation axis when the drum rotates, wherein the drum comprises: an opening portion formed by penetrating and opening a part of the drum; and a catching tab (514a, 514b) extending from one surface of a circumference of the opening portion to an opened portion, an opening portion formed by penetrating and opening a part of the drum; and a catching tab (514a, 514b) extending from one surface of a circumference of the opening portion to an opened portion, wherein the lifter (61a, 61b, 62a, 62b, 63a, 63b) comprises: a lifter frame installed on the inner circumferential surface of the drum; and a frame cover coupled to the lifter frame and protruding radially inward from the inner circumferential surface of the drum, a lifter frame installed on the inner circumferential surface of the drum; and a frame cover coupled to the lifter frame and protruding radially inward from the inner circumferential surface of the drum, wherein the lifter frame comprises: a frame base coupled to the inner circumferential surface of the drum and having a seating groove formed along a circumference of the frame base; a frame upper plate spaced apart from the frame base in a direction toward the inside of the drum; and a frame sidewall configured to connect the frame upper plate and the frame base; characterized by a catching protrusion protruding from an inner surface of the lifter frame and configured to come into contact with the catching tab (514a, 514b) when the lifter frame is coupled to the inner circumferential surface of the drum, and wherein the catching protrusion is formed to be symmetrical based on a center in a plan view of the lifter frame. a frame base coupled to the inner circumferential surface of the drum and having a seating groove formed along a circumference of the frame base; a frame upper plate spaced apart from the frame base in a direction toward the inside of the drum; and a frame sidewall configured to connect the frame upper plate and the frame base; characterized by a catching protrusion protruding from an inner surface of the lifter frame and configured to come into contact with the catching tab (514a, 514b) when the lifter frame is coupled to the inner circumferential surface of the drum, and wherein the catching protrusion is formed to be symmetrical based on a center in a plan view of the lifter frame.