A laundry treating apparatus comprising: a cabinet having a detergent opening defined a front surface thereof; a tub located inside the cabinet and configured to store wash water therein; a drum rotatably disposed inside the tub and configured to store laundry therein; a storage including a storage frame having a detergent storage space defined therein for storing detergent to be supplied to the tub, wherein the storage is configured to be retracted into or extended out of the cabinet through the detergent opening; and a fixing assembly disposed inside the cabinet to face the storage, wherein the fixing assembly includes a fastening elastic portion protruding toward the storage, wherein the storage frame includes: a frame outer wall for forming an outer wall of the storage frame and surrounding the detergent storage space, wherein the frame outer wall includes a front outer wall positioned on a front side of the storage frame and a rear outer wall positioned on a rear side of the storage frame; and a frame partition wall disposed in the storage frame to partition the detergent storage space, wherein the frame partition wall connects the front outer wall and the rear outer wall to each other, and wherein the frame partition wall includes a fastening protrusion protruding toward the fixing assembly, wherein the fastening elastic portion is pressurized and elastically deformed by the fastening protrusion during the retraction and the extension of the storage, characterised in that a rear end of the fastening protrusion is connected to the rear outer wall and extends downward to form one surface with a rear portion of the rear outer wall. a cabinet having a detergent opening defined a front surface thereof; a tub located inside the cabinet and configured to store wash water therein; a drum rotatably disposed inside the tub and configured to store laundry therein; a storage including a storage frame having a detergent storage space defined therein for storing detergent to be supplied to the tub, wherein the storage is configured to be retracted into or extended out of the cabinet through the detergent opening; and a fixing assembly disposed inside the cabinet to face the storage, wherein the fixing assembly includes a fastening elastic portion protruding toward the storage, wherein the storage frame includes: a frame outer wall for forming an outer wall of the storage frame and surrounding the detergent storage space, wherein the frame outer wall includes a front outer wall positioned on a front side of the storage frame and a rear outer wall positioned on a rear side of the storage frame; and a frame partition wall disposed in the storage frame to partition the detergent storage space, wherein the frame partition wall connects the front outer wall and the rear outer wall to each other, and wherein the frame partition wall includes a fastening protrusion protruding toward the fixing assembly, a frame outer wall for forming an outer wall of the storage frame and surrounding the detergent storage space, wherein the frame outer wall includes a front outer wall positioned on a front side of the storage frame and a rear outer wall positioned on a rear side of the storage frame; and a frame partition wall disposed in the storage frame to partition the detergent storage space, wherein the frame partition wall connects the front outer wall and the rear outer wall to each other, and wherein the frame partition wall includes a fastening protrusion protruding toward the fixing assembly, wherein the fastening elastic portion is pressurized and elastically deformed by the fastening protrusion during the retraction and the extension of the storage, characterised in that a rear end of the fastening protrusion is connected to the rear outer wall and extends downward to form one surface with a rear portion of the rear outer wall.