A laminated film of a propylene resin layer and an ethylene resin layer is provided, which does not require solvent removal and recovery devices, etc., is low in influences against working environments and a danger of occurrence of fire, and has a high interlaminar adhesive force. That is, the invention relates to a laminated film prepared by melt extrusion laminating, without via an anchor coating agent, an ethylene based resin mainly comprising a linear ethylene/.alpha.-olefin copolymer having: a density of from 0.870 to 0.910 g/cm.sup.3; and an MFR of from 1 to 100 g/10 min., the copolymer being obtained by copolymerizing ethylene and an .alpha.-olefin having from 3 to 20 carbon atoms, on the surface of a propylene based resin film formed from a crystalline propylene based random copolymer resin having a melting peak temperature of not higher than 140.degree. C., as prepared using a metallocene catalyst.