The present invention provides a laminated polyester film which can be suitably used in the applications requiring good adhesion to a micro-lens layer, a prism layer or the like, for example, in the optical applications such as a backlight unit for liquid crystal displays, etc. The laminated polyester film of the present invention comprises a polyester film, and (A) a coating layer comprising a urethane resin and an isocyanate compound derived from an aliphatic isocyanate or an alicyclic isocyanate or (B) a coating layer comprising a urethane resin having a polycarbonate structure and an isocyanate-based compound, which is formed on at least one surface of the polyester film.