NOVELTY - An aromatic polyester film (1) contains a void (100), and comprises a cyclic carbodiimide compound having cyclic structure(s) containing one carbodiimide group in the ring skeleton, and in which two nitrogen atoms are bonded with a bonding group, or a ketene imine compound. The content of cyclic carbodiimide compound or ketene imine compound is 0.1-5 %mass. The void has an average aspect ratio of 4-20 and a length of 5-40 mu m. In a film cross-section, the number of voids with the long axis contained in cross-section perpendicular to the film plane is 1-30/100 mu m2.    USE - Aromatic polyester film is used for laminated films used for backsheets of solar-cell modules (all claimed).    ADVANTAGE - The aromatic polyester film can be cut without any wastage, by setting the number and shape of void. The polyester film has excellent adhesiveness with respect to solar-cell panels.    DETAILED DESCRIPTION - An aromatic polyester film contains a void, and comprises a cyclic carbodiimide compound having cyclic structure(s) containing one carbodiimide group in the ring skeleton, and in which two nitrogen atoms are bonded with a bonding group, or a ketene imine compound. The content of cyclic carbodiimide compound or ketene imine compound is 0.1-5 %mass. The void has an average aspect ratio of 4-20 and a length of 5-40 mu m. In a cross-section of the aromatic polyester film, the number of voids with the long axis contained in cross-section perpendicular to the film plane and the number of voids perpendicular to cross-section (I) and contained in cross-section (II) perpendicular to the film plane are 1-30/100 mu m2. INDEPENDENT CLAIMS are included for the following:    (1) laminated film consisting of 2-8 layers, with at least one layer being the aromatic polyester film; and    (2) manufacture of aromatic polyester film, which involves mixing aromatic polyester resin, cyclic carbodiimide compound or ketene imine compound, and incompatible resin, forming the mixture into a sheet, stretching the sheet, and forming a void. A temperature difference of 0.5-10 degrees C is provided before and after the stretching process.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view and sectional views of the aromatic polyester film. (Drawing includes non-English language text)    Aromatic polyester film (1)    Surface (1a)    Void (100)    Measuring range (S)    Average shorter axis of void (r)