PURPOSE: To improve the productivity in a warm spinning forming of magnesium alloy by attaining the warm spinning forming having good surface property without lubricating.

CONSTITUTION: A rim part Mr of an intermediate stock M almost shaped with a die forging is worked with the warm spinning forming to a prescribed wheel shape without lubricating by using a roller 5 composed of ceramics. Therefore, the warm spinning forming having good surface property can be realized even without lubricating by using the roller composed of ceramics having low affinity magnesium so that the productivity can be improved, and high quality of products can be secured.