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 (2a, 2b) 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 (3a, 3b) of said unvulcanized rubber sheet in the width direction are located on an inner side of both end portions (2a, 2b) 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 composed of a composite layer of a first layer disposed on the inner side of the tire and a second layer disposed in contact with said unvulcanized rubber sheet, said first layer being made of an elastomer composition containing an SIBS modified copolymer having a styrene block moiety of a styrene-isobutylene-styrene block copolymer modified with an acid chloride having an unsaturated bond or an acid anhydride and having a thickness of 0.05 mm to 0.6 mm, said second layer being made of an elastomer composition containing at least one of a styrene-isoprene-styrene block copolymer and a styrene-isobutylene block copolymer, 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 (2a, 2b) 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 (3a, 3b) of said unvulcanized rubber sheet in the width direction are located on an inner side of both end portions (2a, 2b) 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,