A method of manufacturing a laminate structure (1,10) comprising a pressure sensitive adhesive sheet, the pressure sensitive adhesive sheet comprising a base material and a pressure sensitive adhesive layer laminated on one surface of the base material, wherein the method comprises one selected from, and: a first coextrusion molding step of performing coextrusion molding of a first resin composition for forming the base material and a second resin composition for forming the pressure sensitive adhesive layer thereby to obtain a first laminate as the pressure sensitive adhesive sheet, the first laminate being formed such that the base material and the pressure sensitive adhesive layer are laminated on each other; a second coextrusion molding step of performing coextrusion molding of a third resin composition for forming a release sheet and a second resin composition for forming the pressure sensitive adhesive layer thereby to obtain a second laminate formed such that the release sheet and the pressure sensitive adhesive layer are laminated on each other in a releasable manner, and a base material laminating step of laminating the base material on a surface of the second laminate at a side of the pressure sensitive adhesive layer to obtain the laminate structure comprising the pressure sensitive adhesive sheet and the release sheet; and a third coextrusion molding step of performing coextrusion molding of a first resin composition for forming the base material, a second resin composition for forming the pressure sensitive adhesive layer and a third resin composition for forming a release sheet thereby to obtain a third laminate as the laminate structure comprising the pressure sensitive adhesive sheet and the release sheet, the third laminate being formed such that the base material is laminated on one surface of the pressure sensitive adhesive layer and the release sheet is laminated on other surface of the pressure sensitive adhesive layer in a releasable manner, wherein the second resin composition contains a main resin and a first resin, characterized in that: the first resin is a noncrosslinked-type resin having compatibility with the main resin, the first resin is a resin of the same series as the main resin, and the first resin is supplied as a powder when the second resin composition is prepared. a first coextrusion molding step of performing coextrusion molding of a first resin composition for forming the base material and a second resin composition for forming the pressure sensitive adhesive layer thereby to obtain a first laminate as the pressure sensitive adhesive sheet, the first laminate being formed such that the base material and the pressure sensitive adhesive layer are laminated on each other; a second coextrusion molding step of performing coextrusion molding of a third resin composition for forming a release sheet and a second resin composition for forming the pressure sensitive adhesive layer thereby to obtain a second laminate formed such that the release sheet and the pressure sensitive adhesive layer are laminated on each other in a releasable manner, and a base material laminating step of laminating the base material on a surface of the second laminate at a side of the pressure sensitive adhesive layer to obtain the laminate structure comprising the pressure sensitive adhesive sheet and the release sheet; and a third coextrusion molding step of performing coextrusion molding of a first resin composition for forming the base material, a second resin composition for forming the pressure sensitive adhesive layer and a third resin composition for forming a release sheet thereby to obtain a third laminate as the laminate structure comprising the pressure sensitive adhesive sheet and the release sheet, the third laminate being formed such that the base material is laminated on one surface of the pressure sensitive adhesive layer and the release sheet is laminated on other surface of the pressure sensitive adhesive layer in a releasable manner, the first resin is a noncrosslinked-type resin having compatibility with the main resin, the first resin is a resin of the same series as the main resin, and the first resin is supplied as a powder when the second resin composition is prepared.