A biaxially oriented polyester film having improved surface properties, scratch resistance and abrasion resistance comprises the particulate slip agents of a calcium carbonate having an average particle diameter ranging from 0.01 to 3 .mu.m, alumina having an average particle diameter ranging from 0.005 to 3 .mu.m and a Mohs' hardness of 8 or more and a melamine formaldehyde condensate having an average particle diameter ranging from 0.01 to 3 .mu.m, wherein each of the slip agents is in an amount ranging from 0.01 to 4 wt. % based on the weight of the polyester.The film is useful in manufacturing condensers, medical articles, photographic films, packaging and labelling materials and, particularly, magnetic recording media.