To provide a laminated packaging material wherein a plant-origin material is used as the main material constituting a laminated paper packaging material for foods; a laminated packaging material being excellent in oxygen-barrier performance; a method of producing a barrier laminated packaging material in a small number of steps; a method of producing a barrier laminated packaging material whereby the structure of the laminate can be simplified without a need for a petroleum-derived adhesive and the laminate thickness can be reduced; and a method of producing a barrier laminated packaging material which is free from the occurrence of defects such as pinholes in spite of having a thin barrier layer.[Means for Solving Problems] A laminated packaging material for foods which is a laminated packaging material comprising a paper core layer, a barrier layer and a thermoplastic resin layer, wherein the barrier layer is made of polyvinyl alcohol, while the thermoplastic resin layer is made of a resin composition containing a plant-origin plastic and having melt extrudability.