A method for manufacturing a pneumatic tire having an inner liner on an inner side of the tire, molding of a green tire comprising: (a) an assembly step of bonding the inner liner and an unvulcanized rubber sheet, wherein said inner layer has a width larger than that of said unvulcanized rubber sheet, with end portions of said inner liner and the unvulcanized rubber sheet in a width direction being displaced from each other by 50 mm to 500 mm in the width direction such that both end portions of said unvulcanized rubber sheet in the width direction are located on an inner side of both end portions of said inner liner in the width direction to manufacture a laminate; (b) a cutting step of cutting said laminate to have a constant length corresponding to a width of a drum to manufacture a cut sheet; and (c) a joining step of winding said cut sheet on entire circumference of the drum such that a cut surface thereof extends in a circumferential direction of the drum and the inner liner is disposed on an inner surface side, and joining said cut sheet such that the both end portions (2a, 2b) of said inner liner in the width direction overlap each other, wherein the both end portions (3a, 3b) of the unvulcanized rubber sheet in the width direction are joined using an unvulcanized rubber piece, said inner liner being a laminate of a first layer and a second layer, the first layer being a polymer composition containing 0.1 to 50 parts by mass of an organic derivative of a clay mineral relative to 100 parts by mass of a thermoplastic elastomer mixture containing 60 to 99% by mass of a styrene-isobutylene-styrene block copolymer and 1 to 40 % by mass of a polyamide-based polymer which contains polyamide in a molecular chain and has a Shore D hardness of 70 or less, and having a thickness of 0.05 mm to 0.6 mm, the second layer being disposed on a side of the unvulcanized rubber sheet, made of a thermoplastic elastomer composition, and having a thickness of 0.01 mm to 0.3 mm. (a) an assembly step of bonding the inner liner and an unvulcanized rubber sheet, wherein said inner layer has a width larger than that of said unvulcanized rubber sheet, with end portions of said inner liner and the unvulcanized rubber sheet in a width direction being displaced from each other by 50 mm to 500 mm in the width direction such that both end portions of said unvulcanized rubber sheet in the width direction are located on an inner side of both end portions of said inner liner in the width direction to manufacture a laminate; (b) a cutting step of cutting said laminate to have a constant length corresponding to a width of a drum to manufacture a cut sheet; and (c) a joining step of winding said cut sheet on entire circumference of the drum such that a cut surface thereof extends in a circumferential direction of the drum and the inner liner is disposed on an inner surface side, and joining said cut sheet such that the both end portions (2a, 2b) of said inner liner in the width direction overlap each other, wherein the both end portions (3a, 3b) of the unvulcanized rubber sheet in the width direction are joined using an unvulcanized rubber piece, said inner liner being a laminate of a first layer and a second layer, the first layer being a polymer composition containing 0.1 to 50 parts by mass of an organic derivative of a clay mineral relative to 100 parts by mass of a thermoplastic elastomer mixture containing 60 to 99% by mass of a styrene-isobutylene-styrene block copolymer and 1 to 40 % by mass of a polyamide-based polymer which contains polyamide in a molecular chain and has a Shore D hardness of 70 or less, and having a thickness of 0.05 mm to 0.6 mm, the second layer being disposed on a side of the unvulcanized rubber sheet, made of a thermoplastic elastomer composition, and having a thickness of 0.01 mm to 0.3 mm.