To manufacture a multilayer film of superior transparency, glossiness and gas barrier properties functioned as a skin pack packaging bottom material by being combined with a cover material formed of the flexible multilayer film and provided with the curling prevention effect on seal ends with the cover material.

A multilayer film is formed of an outermost layer composed of propylene resin, a core layer composed of gas barrier resin and an innermost layer composed of heat seal resin selected out of a copolymer composed of ionomer, ethylene and carboxylic vinyl or a copolymer composed of ionomer, ethylene and (meth)acrylic ester.