Abstract: A light shielding heat-resistant sheet material has a film substrate sheet of a polyethylene naphthalate resin and/or a polyimide resin, and a two-component curable polyester resin paint coated on one or both surfaces of the film substrate. The two-component curable polyester resin paint has a polyester resin as a principal agent, an isocyanate compound as a curing agent, and a black pigment. The sheet material can be used as a blade member in a light amount regulating apparatus to be incorporated in an optical equipment, such as a projector. The blade member resists deformation by heat and has reduced weight, and thereby enables secure light amount regulation while operating smoothly and quietly.