The present invention relates to a wheel manufacturing apparatus using a three-gate system, which comprises: an upper mold; and a lower mold. The lower mold has a molding space including a disc molding unit and a rim molding unit provided between the lower mold and the upper mold, and includes a center-gate for injecting molten metal into the disc molding unit and a pair of side-gates for injecting the molten metal into the rim molding unit. Moreover, at least a portion of lower surfaces of the side-gates connected to the rim molding unit has an inflection point formed higher than the lowest point of a rear surface of a spoke formed inside the disc molding unit.
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