TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The white inorganic fine particles: comprise titanium dioxide, barium sulfate, silicon oxide, aluminum oxide, magnesium oxide, calcium carbonate, kaolin or talc; and have an volume average particle diameter of 0.15-0.5 mu m.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The binder is at least one polymer including a polyolefin resin, acrylic resin or silicone resin, where one of the polymer layers comprises the silicone resin as the binder, and the other of the polymer layers comprises the polyolefin resin or the acrylic resin as the binder. The polymer sheet further comprises: a protective polymer layer comprising a resin (including a silicone resin or fluorocarbon resin), and inorganic fine particles ( less than or equal to 1 mass% with respect to a total mass of the protective polymer layer) on the one of the polymer layers comprising the silicone resin as the binder; and a rear face protecting layer disposed on an opposite side of the support from a surface of the support that faces a cell side board. The polymer layer further comprises a crosslinking agent (0.5-25 mass% with respect to a total mass of the binder contained in the polymer layers). The rear face protecting layer comprises a fluorocarbon-based polymer or silicone-based polymer as a main binder. The support comprises polyester, which is a straight chain saturated polyester that is synthesized from an aromatic dibasic acid and a diol or their ester-forming derivatives, by solid phase polymerization, by which a polymerization degree of the polyester is increased, after primary polymerization by heating the polyester at 170-240 degrees C for 5-100 hours in a vacuum or in an atmosphere of nitrogen gas, where the content of carboxyl groups in the polyester is less than or equal to 55 moles/ton. The crosslinking agent is a carbodiimide-based crosslinking agent or an oxazoline-based crosslinking agent. EXAMPLE - No suitable example given.