NOVELTY - A thermoplastic-resin sheet consists of a thermoplastic resin layer containing a polyester resin. The content of alicyclic diol component in the resin layer is 0.5-10 mol% with respect to all diol components in the resin layer, and/or the sum total content of alicyclic dicarboxylic acid component, isophthalic-acid component, and naphthalene dicarboxylic acid component in the resin layer is 0.5-10 mol% with respect to the entire dicarboxylic acid components in the resin layer. The carboxyl-end-group concentration is less than 35 eq/polyester 106 g.    USE - Thermoplastic-resin sheet is used for back sheets used as back-surface sealing material of solar cells (claimed) integrated in roof materials. Can also be used for other electronic components and decorative boards.    ADVANTAGE - The thermoplastic-resin sheet has excellent economical efficiency, flexibility, mechanical property, heat resistance, gas barrier property, opacifying property, hydrolysis resistance, weather resistance, reflectance, and interfacial peeling resistance. The sheet provides solar cells having excellent photoelectric conversion efficiency and reduced electric current leakage.    DETAILED DESCRIPTION - A thermoplastic-resin sheet consists of a thermoplastic resin layer containing a polyester resin. The resin layer is located in an outermost layer. The content of alicyclic diol component in the resin layer is 0.5-10 mol% with respect to all diol components in the resin layer, and/or the sum total content of alicyclic dicarboxylic acid component, isophthalic-acid component, and naphthalene dicarboxylic acid component in the resin layer is 0.5-10 mol% with respect to the entire dicarboxylic acid components in the resin layer. The carboxyl-end-group concentration is less than 35 eq/polyester 106 g. An INDEPENDENT CLAIM is included for manufacture of thermoplastic-resin sheet, which involves melt-kneading resin and particles to obtain a masterbatch, carrying out solid-state polymerization of the masterbatch, and forming a film using the masterbatch.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the solar cell which uses the thermoplastic-resin sheet.    High light-ray transmission material (1)    Solar-cell module (2)    Filling resin (3)    Back sheet (4)    Solar cell (10)