PURPOSE: To sufficiently suppress the maximum surface roughness of the surface of aluminum tube to a small value, and to surely remove burrs which may cause the defective image or the like.

CONSTITUTION: After the outer circumferential surface of an aluminum stock tube 10 is mechanically removed (the cutting by the bite, the centerless grinding, the super-finish grinding, the peeling, the peeling by the grinding tape), the aluminum stock tube 10 is dipped in the treatment liquid 82 to solve and remove the burrs on the surface. The maximum surface roughness is improved by achieving the roller burnishing on the outer circumferential surface of this aluminum stock tube 10.