A laundry treating apparatus includes: a drum configured to receive laundry and to rotate about a rotation axis that extends in a front-rear direction of the laundry treating apparatus; and a lifter disposed on an inner circumferential surface of the drum and configured to rotate about the rotation axis based on rotation of the drum. The lifter includes: a lifter upper plate portion spaced apart from the inner circumferential surface of the drum, a lifter sidewall portion that is made of metal and that extends from lifter upper plate portion toward the inner circumferential surface of the drum, and a side protrusion that protrudes from an outer surface of the lifter sidewall portion. The lifter sidewall portion has a lower end coupled to the inner circumferential surface of the drum and an upper end connected to the lifter upper plate portion.