TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Particles: The composition (C2) of layer (L2) contains inactive particles (1-30). The polyester of the composition (C1) does not contain antimony.    TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The thickness of the layer (L1) is 40-90 with respect to total thickness of 100 of layers (L1,L2). The laminated film has thickness of 25-250 microns. The layer (L2) is biaxially oriented. The laminated film has thermal contraction rate along both directions of at most 0.5% at 85degreesC. The laminated film consists of 3 layers in which layer (L1) is laminated on both the surfaces of layer (L2). EXAMPLE - Polyester resin (polyethylene terephthalate) containing diethylene glycol component of 2.5 wt.%, germanium element of 50 ppm and lithium element of 5 ppm, was prepared using dimethyl terephthalate, 2,6-naphthalene dimethyl dicarboxylate, ethylene glycol, diethylene glycol, manganese acetate, lithium acetate, trimethyl phosphate and germanium dioxide. The obtained polyester and barium sulfate (35 wt.%) as inactive particle having average particle diameter of 1.2 microns, as composition for layer (L1) and obtained polyester and barium sulfate (5 wt.%) as inactive particle having average particle diameter of 1.2 microns as composition for layer (L2), were extruded by two sets of extruder and molded in lamination state of layers (L1,L2). The obtained laminate was cooled with a cooling roll at surface temperature of 25degreesC, extended along vertical direction, cooled, extended along horizontal direction, heat set, and relaxed along vertical and horizontal directions, cooled to room temperature, and biaxially stretched film was obtained as reflecting plate base material. The obtained film had thermal contraction rate of 0.1% along horizontal direction and vertical direction at 85degreesC, and favorable reflectance, ductility and light resistance without deformation. The layer (L1) had glass transition point of 81degreesC and melting point of 225degreesC without antimony. The layer (L2) had glass transition point of 83degreesC and melting point of 225degreesC.