The present invention relates to a laminated polyester film that can exhibit good adhesion to various surface functional layers such as a hard coat layer, a microlens layer and a prism layer, and can be suitably used as various optical members such as, for example, a backlight unit of liquid crystal displays, etc. The laminated polyester film of the present invention comprises a polyester film and a coating layer formed on at least one surface of the polyester film which is produced by applying a coating solution comprising an active methylene-blocked polyisocyanate compound thereonto.