Abstract: A tire component that has no defect caused by air insertion in an uneven portion and gives no defective external appearance caused by the uneven portions through laminate molding a belt-shaped rubber. A molding device has a rubber extruder having a mouthpiece with a rhombic cross-section, and upper and lower rollers, rolling a belt-shaped rubber with the rhombic cross-section extruded through the mouthpiece into a hexagonal cross-section.

Abstract: A method for manufacturing a base tire ensuring a cure-molding of a green tire therefor without overcure or undercure in the thin-walled shoulder portions of the tread region and the bead regions, a curing machine that preferably enables the base tire manufacturing method, and a base tire thus manufactured are provided. To that end, a base tire is enclosed within a curing mold, the side regions of the base tire are heated by a first heating means, the tread region of the base tire is heated by a second heating means, and a cure-molding is performed such that the amount of heat given to the tread region by the second heating means is smaller than the amount of heat given to the side regions by the first heating means.