A tire comprising: one tire constituent member and another tire constituent member that are formed of a thermoplastic material; wherein the tire comprises a first welded portion in which one section of the one tire constituent member and one section of the other tire constituent member are both melted and welded, the one tire constituent member configures one side of the tire across the tire equatorial plane and the other tire constituent member configures the other side of the tire across the tire equatorial plane and the first welded portion is disposed on a tire inner surface side configured by the one tire constituent member and the other tire constituent member, and the second welded portion is disposed on a tire outer surface side; and a second welded portion formed by circumferentially extruding and welding a welding-use thermoplastic material to the surface of the first welded portion and the first welded portion and the second welded portion are disposed on the tire equatorial plane, wherein the first welded portion and the second welded portion have bilaterally symmetrical shapes across the tire equatorial plane, wherein the welding-use thermoplastic material of the second welded portion is welded to both the one section of the one tire constituent member and the one section of the other tire constituent member at the first welded portion; the tire inner surface side of the first welded portion configured by the one tire constituent member and the other tire constituent member is convex, the tire outer surface side of the first welded portion is concave, and the second welded portion is configured as a result of the concave section of the first welded portion being filled with the welding-use thermoplastic material. one tire constituent member and another tire constituent member that are formed of a thermoplastic material; wherein the tire comprises a first welded portion in which one section of the one tire constituent member and one section of the other tire constituent member are both melted and welded, the one tire constituent member configures one side of the tire across the tire equatorial plane and the other tire constituent member configures the other side of the tire across the tire equatorial plane and the first welded portion is disposed on a tire inner surface side configured by the one tire constituent member and the other tire constituent member, and the second welded portion is disposed on a tire outer surface side; and a second welded portion formed by circumferentially extruding and welding a welding-use thermoplastic material to the surface of the first welded portion and the first welded portion and the second welded portion are disposed on the tire equatorial plane, wherein the first welded portion and the second welded portion have bilaterally symmetrical shapes across the tire equatorial plane, wherein the welding-use thermoplastic material of the second welded portion is welded to both the one section of the one tire constituent member and the one section of the other tire constituent member at the first welded portion; the tire inner surface side of the first welded portion configured by the one tire constituent member and the other tire constituent member is convex, the tire outer surface side of the first welded portion is concave, and the second welded portion is configured as a result of the concave section of the first welded portion being filled with the welding-use thermoplastic material.