PURPOSE: To make it possible to mold a radial tire in a single stage wherein displacement of a bead ring is surely prevented when both ends of a carcass sheet are turne up to improve accuracy of dimension and shape of a tire and durability of a bead part is improved.

CONSTITUTION: There are provided a drum assembly 2 with a drum 9 which winds a carcass sheet A into a cylindrical shape and whose diameter can be expanded, a transversely movable bead supporting means 3 provided with a receiver 19 for receiving a bead ring B disposed outside the sheet A, and a bladder 4 for turning up a protruding part A1 of the sheet A. A protrusion 6 which can hold the bead ring B through the sheet A between the receiver 19 and the protrusion 6 is provided on either side of the drum 9.