TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The ester plasticizer is polyester or hydroxyl carboxylic acid ester compound. The polyhydric carboxylic acid is 4-12C aliphatic saturated dicarboxylic acid. The polyhydric alcohol is 2-12C aliphatic saturated diol. The polyhydric carboxylic acid and polyhydric alcohol has total average carbon atom number of 8-20. The polyester has at least one functional group chosen from hydroxyl group, carboxyl group and carboxylate group in a molecule, preferably hydroxyl group. The average molecular weight based on gel permeation chromatography (GPC) analysis of the polyester is 200-5000. The molecular weight based on hydroxyl value of polyester of polyester containing hydroxyl group is 200-2500. The concentration of hydroxy carboxylic acid ester compound is 5-100 parts mass with respect to polyvinyl acetal (100 parts mass). The hydroxy carboxylic acid ester compound is ricinolic acid and 2-20C polyvalent aliphatic alcohol. The ether type plasticizer comprises (in parts mass): polyether compound (5-100) with respect to polyvinyl acetal (100). The polyether compound is chosen from poly(1,2-propylene glycol), poly(1,2-butylene glycol), and compound having group derived from polyethylene glycol. Preferred Composition: The polyester comprises condensation polymer of polyhydric carboxylic acid, carbonic acid compound and polyhydric alcohol. The polyester further comprises polymer of hydroxy carboxylic acid or 2-10C lactone compound having carbon number of 2-10. The polyvinyl acetal composition has acid value of 10 mg potassium hydroxide/g or less, average acetalization degree of 40-85 mol.%, average vinyl ester unit content of 0.01-30 mol.% and glass transition temperature of 0-50 degrees C. The polyvinyl acetal composition is obtained by subjecting the polyvinyl acetal to acetalization process and polymerizing the acetalized polyvinyl acetal and vinyl alcohol type polymer at 150-3000 degrees C, where the polyvinyl acetal is polyvinyl butyral. Preferred Components: The resin is poly(methyl methacrylate) or aromatic polycarbonate. The resin is polymer chosen from 2-12C aliphatic unsaturated hydrocarbon, 8-12C aromatic unsaturated hydrocarbon or its hydrogenated substance. The resin is block copolymer containing polymeric block (X) of 8-12C aromatic unsaturated hydrocarbon and polymeric block (Y) of 2-12C aliphatic conjugated polyene. The aromatic unsaturated hydrocarbon is styrene. The aliphatic conjugated polyene is chosen from butadiene, isoprene butadiene and isoprene. EXAMPLE - No suitable example given.