A bead apex rubber forming method to form the bead apex rubber continuously in a full circle on an outer circumferential surface of the annular bead core having a core axis, wherein the method comprises a molding process to form the bead apex rubber integrally on the outer circumferential surface (As) of the bead core rotating around the core axis by flowing unvulcanized rubber from a rubber inflow port positioned in a first inner wall surface of a molding head into a bead apex molding chamber, the bead apex molding chamber is surrounded by the outer circumferential surface (As) of the bead core, a first inner wall surface of the molding head on one side of the core axis di recti on, and a second inner wall surface of the molding head on the other side of the core axis direction, and the bead apex molding chamber extends in the circumferential direction, and of which circumferential both ends are opened, wherein the molding process comprises a tip forming step to form a tip portion (Bf) of the bead apex rubber between front and rear shutters (20, 21) by flowing the unvulcanized rubber into the bead apex molding chamber, in a closed state that the bead apex molding chamber is closed by the front and rear shutters (20, 21) on the front and rear sides in the bead core rotating direction in relation to the rubber inflow port, and in a rotating stopped state of the bead core, a middle section forming step to form serially the bead apex rubber to be continuous with the tip portion by taking off the front shutter to open the front side in the bead core rotational di recti on and flowing the unvulcanized rubber while rotati ng the bead core, and a joining step to joint integrally the back-end portion (Br) and the tip portion (Bf) by a rubber connecting portion (Bm), and wherein, in the joining step, the bead core is stopped when the tip portion (Bf) returns again to the bead apex molding chamber, the rear shutter is taken off to open the rear side in the bead core rotational di recti on and to form a connecting space between the back-end portion (Br) and the tip portion (Bf) of the bead apex rubber, and the unvulcanized rubber is flowed into the connecting space to form the rubber connecting portion (Bm). a tip forming step to form a tip portion (Bf) of the bead apex rubber between front and rear shutters (20, 21) by flowing the unvulcanized rubber into the bead apex molding chamber, in a closed state that the bead apex molding chamber is closed by the front and rear shutters (20, 21) on the front and rear sides in the bead core rotating direction in relation to the rubber inflow port, and in a rotating stopped state of the bead core, a middle section forming step to form serially the bead apex rubber to be continuous with the tip portion by taking off the front shutter to open the front side in the bead core rotational di recti on and flowing the unvulcanized rubber while rotati ng the bead core, and a joining step to joint integrally the back-end portion (Br) and the tip portion (Bf) by a rubber connecting portion (Bm), and the bead core is stopped when the tip portion (Bf) returns again to the bead apex molding chamber, the rear shutter is taken off to open the rear side in the bead core rotational di recti on and to form a connecting space between the back-end portion (Br) and the tip portion (Bf) of the bead apex rubber, and the unvulcanized rubber is flowed into the connecting space to form the rubber connecting portion (Bm).