To provide a transparent incombustible sheet comprising a glass fiber fabric and a resin, in which, while enhancing the incombustibility, the decrease in Abbe number of the cured resin component other than the flame-retardant component resulting from the flame-retardant component can be suppressed, and to provide a smoke-proof hanging wall using said transparent incombustible sheet.SOLUTION: Provided is a transparent incombustible sheet comprising a glass fiber fabric and a cured resin layer contained in the glass fiber fabric in an impregnated state, and in which the cured resin layer contains an organic bromine monomer compound. The organic bromine monomer compound is preferably tetrabromobisphenol A.SELECTED DRAWING: Figure 1

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