To make the thickness of a side rubber layer uniform circumferentially in a manufacturing method excellent in operability and productivity in which the generation of cracks which can cause separation troubles in a joint between a pair of right and left side edge rubber parts formed on both sides tread rubber and a side rubber layer.

At least a bead core, a radial carcass, and as required an inner liner and a member for reinforcing the periphery of a bead are assembled on a cylindrical former. With a molded assembly expanded toroidally, a belt and a tread rubber layer are stuck on the outside of crown part, and then a pair of right and left side rubber layers which is molded previously in an another process is stuck on the surface of a side part to produce a green tire, which is vulcanized.