To provide a composite resin molded article excellent in strength and rigidity by welding and integrating a resin core material and a resin outer skin covering the surface through the intervention of a hot-melt surface material, and to provide its manufacturing method.

The composite resin molded article is composed by covering the resin core material 2 with the resin outer skin. The resin core material 2 and the resin outer skin covering the surface are welded and integrated through the intervention of the hot-melt surface material 13. The outer surface of at least one side wall of the resin outer skin is a rugged surface 12 formed for pressurized fluid passage in blow molding. The resin core material 2 has a honeycomb structure having numerous cavities passing through the thickness direction.

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