PROBLEM TO BE SOLVED: To provide a tire component manufacturing method capable of manufacturing a jointless tire component, a tire manufacturing method capable of efficiently manufacturing a tire by using the tire component, and a tire component manufacturing device suitably used for manufacturing the tire component.SOLUTION: The tire component manufacturing method for manufacturing a tire component, includes the injection molding step of injecting a molten tire component to fill a closed area partitioned by at least an inner core and a cylindrical outer core surrounding the inner core from the diameter-direction outside of the inner core. The tire manufacturing method is also a tire manufacturing method using the tire component manufactured by the tire component manufacturing method. Further, the tire component manufacturing device includes: an inner core; an outer core surrounding the inner core; and an injection machine for injecting the molten tire component to the closed area.SELECTED DRAWING: Figure 1
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