A method of manufacturing a display apparatus includes providing a display panel including two substrates facing each other and a display device disposed between the two substrates; providing a touch screen panel attached onto an outer side surface of one of the two substrates; attaching a multilayer protection film including a plurality of films having acid resistance onto the touch screen panel; etching the other of the two substrates; and removing the multilayer protection film. The protection films have penetration holes, each of the protection films having a different average area of the penetration holes in a plan view.