Disclosed is a stretched film excellent in low-temperature heat sealability after corona treatment as well as that before corona treatment and/or in heat shrinkability, the stretched film being comprised of a layer comprising a copolymer of propylene with null-olefin and/or ethylene such that in measurement of a DSC curve the amount of the heat absorbed in the temperature range of from Tnull10 (null C.) to Tnull10 (null C.) accounts for from 15 to 36% of the amount of the heat absorbed in the temperature range of from 53 to 170null C., wherein T denotes a temperature (null C.) at which a maximum endothermic peak appears in the DSC curve.