An adhesive tape situated near an edge of a glass board with a protection film pasted on both surfaces thereof, and a stripping head that presses an adhesive surface of the adhesive tape toward the glass board, are provided. An actuator is provided that separates the adhesive tape adhering to the edge of protection film from the surface of the glass board and that strips a part of the protection film from the glass board. A film chuck device is provided that holds the stripped edge of the protection film, and the protection film held by the film chuck device is pulled off by driving the glass board by a roller conveyor.