Manufacturing method of cylindrical member and manufacturing method of vibration damping rubber bushing having the cylindrical member

The invention provides a manufacturing method of cylindrical member, which can improve the design free degree of the projections dispsoed on the axial end face of the cylindrical member without influencing the rotation preventing function, can prevente rainwater or the like from flowing through the axial end face of the cylindrical member and entering into its inner circumferential surface, and can form the projections of new pattern on the axial end face of the cylindrical member without causing complication or macro-scale to the processing equipment. The method comprises the steps of: employing a roller die, which is provided with a circumferential die groove of annular form extending through a medial section in a generatrix direction of a die face defined by an integral tapered outside peripheral face, and with a plurality of sloping die grooves extending in a tapered slope direction of the die face situated to both large-diameter and small-diameter sides of the circumferential die groove; providing plasti