PURPOSE: To prevent winding step on the projection part of a screen in the case the screen is drawn and used by attaching a ring member for preventing the winding step on both ends of a cylindrical body to which the screen is rolled up and which is positioned outside the projection part of the screen.

CONSTITUTION: As to this projection screen A, a supporting shaft 3 protruded from both ends of the cylindrical body 2 to which the screen is rolled up and on which the ring member 1 for preventing the winding step is provided on both ends is turnably and pivotally fixed to both side walls 4a and 4a of an armour case 4. The screen 6 on the rear end of which a balance bar 5 is provided is wound to the cylindrical body 2, the screen 6 is wound by automatically rotating the cylindrical body 2 by means of a pressing screw provided inside the cylindrical body 2 or a winding device in which an electric motor is used, and the entire projection screen A is attached to a wall surface 8, etc., by means of a mounting bracket. Thus, the screen 6 can be wound on the member 1 positioned outside the screen projection part 6a and provided on the cylindrical body 2.