A laundry treating apparatus includes: a drum defining a mounting slot and a lifter coupled to the mounting slot and disposed on an inner circumferential surface of the drum. A lifter frame includes: a frame base coupled to the inner circumferential surface; a frame upper plate; a frame sidewall that connects the frame upper plate to the frame base and that defines a lateral through-hole; and an insertion protrusion configured to be inserted into the mounting slot. The insertion protrusion includes a vertical portion that extends downward from a bottom surface of the frame base to the frame base and a catching portion that is curved from a lower end of the vertical portion toward an inside of the periphery of the frame base. A projection plane of the catching portion onto the frame base is positioned within a projection plane of the lateral through-hole onto the frame base.