Disclosed is a laundry treating apparatus including a cabinet, a tub, a drum, and a detergent storage unit, wherein the detergent storage unit includes a detergent storage unit frame having an open top face and retracted into and extended from the cabinet through a opening, an locking bar disposed on the detergent storage unit frame and restricting an extension distance of the detergent storage unit extending from the cabinet, and a detergent cup accommodated in the detergent storage unit frame through the open top face of the detergent storage unit frame, wherein the detergent cup stores the detergent therein and includes a separation preventing protrusion protruding from a side wall, wherein upward deviation of the detergent cup from the detergent storage unit frame is restricted as the separation preventing protrusion is located below the locking bar.