To provide a gas barrier polypropylene based laminate film having a high interlaminar adhesion, transparency, and gas barrier properties to oxygen and moisture vapor.

The laminate film is prepared. The laminate film comprises a core layer constituted by a polypropylene based resin, a skin layer formed on one side of the core layer, and constituted by at least a polypropylene homopolymer, an anchor layer formed on the skin layer, and containing an anchoring agent having an ester bond and/or urethane bond and a silane coupling agent, and a barrier layer formed on the anchor layer and constituted by a water-soluble vinyl based polymer and a layered inorganic compound. The barrier layer may further contain an organic metallic compound having a hydrolysis condensation group. The laminate film may further have a sealant layer formed by an extruded laminate on the barrier layer via an adhesion layer.