PROBLEM TO BE SOLVED: To enable a wheel chair to easily get over a back plate under condition of not interfering storage of the back plate in a storage part of a ceiling when hoisting a curtain body without changing the shape of the back plate.;SOLUTION: A fireproof screen shutter comprises: a fireproof screen 12 having an escape door, provided so as to descend from a ceiling space to partition an indoor space and ascend to be stored in the ceiling space; a back plate 20 having a back plate step portion 50, which is a step portion on the lower side of the escape door 16, and provided so as to reach a floor when the screen 12B is lowered and to be stored in a storage part prepared in the ceiling space when the screen 12 is hoisted; and a step forming member 62B swingably supported on the back plate step portion 50, lowering by its own weight, with at least a part thereof projecting downward from the bottom part of the back plate step portion 50, in a state that the back plate step portion 50 is separated from the floor, and forming a step for alleviating the step of the back plate step portion 50 between the back plate step portion 50 reaching the floor and a floor surface 3 in the state that the back plate step portion 50 reaches the floor.;COPYRIGHT: (C)2013,JPO&INPIT
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