Laminated film

A laminated film comprising a polyester substrate film, and a coating layer on/over at least one surface of the polyester substrate film;

• the coating layer comprising a resin composition comprising, as a constituent component, a resin having an oxazoline group;
• the laminated film having (a) an inorganic thin-film layer on/over the coating layer, and (b) a protective layer that has a urethane resin and has an adhesion amount of 0.15 to 0.60 g/m2 on/over the inorganic thin-film layer;
• the laminated film showing a total reflection infrared absorption spectrum having a ratio P1/P2 ranging from 1.5 to 3.5 wherein P1 is an intensity of a peak having an absorption maximum in a range of 1530±10 cm−1, and P2 is an intensity of a peak having an absorption maximum in a range of 1410±10 cm−1;
• and
• the laminated film having an oxygen permeability of 5 ml/m2·d·MPa or less under conditions of a temperature of 23° C. and a relative humidity of 65%.