NOVELTY - A polyester starting resin (A) is formed from polyester starting resin (A1) and polyester starting resin (A2) and recycled material (B) of polyester resin, are prepared. The starting resin (A1) and mixed starting resin comprising resin (A2) and recycled material (B) (10-40 %mass) are dried, and co-extruded. Resultant product is cooled, solidified on a casting roll in a laminated state, and a laminated component formed from at least two layers is formed. Resultant laminated component is biaxially stretched, to obtain laminated polyester film.    USE - Production of laminated polyester film used for solar cell backsheet for solar cell module (all claimed) used in outdoor, and electrical-electronic components.    ADVANTAGE - The method provides laminated polyester film having excellent hydrolysis resistance, high humidity, and suppressed generation of thickness nonuniformity.    DETAILED DESCRIPTION - A polyester starting resin (A) is formed from polyester starting resin (A1) and polyester starting resin (A2) and recycled material (B) of polyester resin having intrinsic viscosity of 0.55-0.80 equivalents/ton and carboxyl radical weight of 35 equivalents/ton or less, are prepared. The starting resin (A1) and mixed starting resin comprising resin (A2) and recycled material (B) (10-40 %mass) are dried to have water content of 100 ppm or less each, and then co-extruded from a T die such that the extruded molten resin temperature is 280-300 degrees C. The resultant product is cooled and solidified on a casting roll in a laminated state such that the thickness of the film of the molten resin (M1) formed from the resin (A1) is thicker than that of the film of the molten resin (M2) formed from the resin (A2) and the recycled material (B) and a laminated component formed from at least two layers is formed. The resultant laminated component is biaxially stretched, in longitudinal direction and width direction, to obtain laminated polyester film. The polyester starting resin (A) has intrinsic viscosity of 0.60-0.85 equivalents/ton and carboxyl radical weight of 5-20 equivalents/ton. An INDEPENDENT CLAIM is included for laminated polyester film.