PURPOSE: To impart specific heat-shrinkable properties in longitudinal and lateral directions at 90°C and to enhance the transparency after heat shrinkage of a laminated film by irradiating a resin layer formed as an intermediate layer by mixing PVDC and a low m.p. polyamide resin in a specific ratio with electron beam in such a state that PVDC is amorphous to crosslink the same before performing biaxial stretching.

CONSTITUTION: A biaxially stretched film having a heat shrinkage factor of 15% or more at 90°C and excellent in gas barrier properties is composed of a laminate having a mixed resin layer of 5-50wt.% of PVDC and 95-50wt.% of a low m.p. polyamide resin having a crystal m.p. of at most 210°C formed as a barrier layer and crosslinked by the irradiation with electron beam of a dose of 1-12 megarad. At this time, the thickness of the mixed resin layer is 5-30% that of all of layers and, as an outer or inner layer, high or medium density polyethylene is used. By constituting this layer, gas barrier properties, melt flow resistance, heat sealing resistance, cold-resistant strength and transparency are made excellent.