A gear part machining method includes holding one end portion of a cylindrical workpiece via a workpiece spindle such that a center axis of a toothed part extends along a rotation machining axis around which the workpiece spindle is configured to rotate, the toothed part being formed around the center axis of the toothed part on a circumferential surface of the cylindrical workpiece by performing tooth forming; measuring the toothed part to calculate a misalignment between the center axis of the toothed part and the rotation machining axis; and machining another end portion of the cylindrical workpiece opposite to the one end portion along the center axis eccentrically relative to the rotation machining axis based on the misalignment.
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