A tire having a rubber assembly including a first rubber member, a second rubber member, and a third rubber member which are arranged in series in the cross-section including the tire rotational axis. The method includes: extruding the unvulcanized rubber assembly as two separate parts which are a first extrusion rubber portion and a second extrusion rubber portion divided at a division surface passing through the unvulcanized first rubber member; winding the first extrusion rubber portion into a base annular body; and forming the unvulcanized rubber assembly by winding the second extrusion rubber portion so that only the first rubber member included in the second extrusion rubber portion overlaps with the first rubber member included in the base annular body.