A laundry treating apparatus includes a cabinet; a tub; a drum; a detergent storage unit retracting or extending into or from the cabinet through a detergent opening; and a protective casing coupled to a front panel and disposed in rear of the detergent opening and surrounding at least a portion of the detergent storage unit retracting into the cabinet, wherein the protective casing has an opening stopper protruding toward the detergent storage unit, wherein the detergent storage unit has a stopper protrusion located in rear of the opening stopper while the detergent storage unit has retracted into the cabinet, wherein during a process of extending the detergent storage unit from the cabinet, the stopper protrusion comes into contact with the opening stopper, thus limiting an extending distance of the detergent storage unit.