To provide a tool for a hot extrusion press for manufacturing a steel tube through hot extrusion.

The tool for a hot extrusion press for manufacturing the steel tube through hot extrusion has a tapered shape on an inner surface on the back surface side of a packing ring behind a die. The angle of the taper of the inner surface on the back surface side of the packing ring is 5-40. In particular, any defect generated in the rear end of a steel tube product having the total length of 500 mm can be prevented, any defective portion of a rear portion of the product in a subsequent process need not be cut off, and a yield can be improved thereby.