A laundry treating apparatus comprising: a cabinet having an opening defined a front side of the cabinet; a tub disposed inside the cabinet; a drum rotatably disposed inside the tub; and a detergent storage unit entered into and drawn out from the cabinet through the opening, wherein detergent is stored in the detergent storage unit, characterized in that: the detergent storage unit includes: a detergent storage frame having an open top face and entered into and drawn out from the cabinet through the opening; a locking bar disposed on the detergent storage frame and restricting a drawn out distance of the detergent storage unit drawn out from the cabinet; and a detergent cup accommodated in the detergent storage frame through the open top face of the detergent storage frame, wherein the detergent cup stores the detergent therein and includes a separation preventing protrusion protruding from a side wall of the detergent cup, wherein at least a portion of the locking bar is located above the separation preventing protrusion, and wherein the detergent cup is restricted from separation from the detergent storage frame by restricting an upward movement of the separation preventing protrusion by the locking bar. a cabinet having an opening defined a front side of the cabinet; a tub disposed inside the cabinet; a drum rotatably disposed inside the tub; and a detergent storage unit entered into and drawn out from the cabinet through the opening, wherein detergent is stored in the detergent storage unit, characterized in that: the detergent storage unit includes: a detergent storage frame having an open top face and entered into and drawn out from the cabinet through the opening; a locking bar disposed on the detergent storage frame and restricting a drawn out distance of the detergent storage unit drawn out from the cabinet; and a detergent cup accommodated in the detergent storage frame through the open top face of the detergent storage frame, wherein the detergent cup stores the detergent therein and includes a separation preventing protrusion protruding from a side wall of the detergent cup, wherein at least a portion of the locking bar is located above the separation preventing protrusion, and wherein the detergent cup is restricted from separation from the detergent storage frame by restricting an upward movement of the separation preventing protrusion by the locking bar. the detergent storage unit includes: a detergent storage frame having an open top face and entered into and drawn out from the cabinet through the opening; a locking bar disposed on the detergent storage frame and restricting a drawn out distance of the detergent storage unit drawn out from the cabinet; and a detergent cup accommodated in the detergent storage frame through the open top face of the detergent storage frame, wherein the detergent cup stores the detergent therein and includes a separation preventing protrusion protruding from a side wall of the detergent cup, a detergent storage frame having an open top face and entered into and drawn out from the cabinet through the opening; a locking bar disposed on the detergent storage frame and restricting a drawn out distance of the detergent storage unit drawn out from the cabinet; and a detergent cup accommodated in the detergent storage frame through the open top face of the detergent storage frame, wherein the detergent cup stores the detergent therein and includes a separation preventing protrusion protruding from a side wall of the detergent cup, wherein at least a portion of the locking bar is located above the separation preventing protrusion, and wherein the detergent cup is restricted from separation from the detergent storage frame by restricting an upward movement of the separation preventing protrusion by the locking bar.