PURPOSE: To shorten the partcontacted with the face to be worked even in case of its shape being in a roller shape as the whole, by forming plural projection bars on the outer surface of the shaft like tool substrate in a circular section, and facing the side edge of at least one projection bar of those projection bars in the direction crossed with the bus along the circumferential direction of the tool substrate.

CONSTITUTION: A high bearing is obtained, by contacting with the face to be worked with the projection bar 3 formed on the outer surface of a tool substrate 1, and the contact length becoming short with its being limited. When this tool substrate is rolled along the face to be worked in the radial direction, the projection bar causes a plastic deformation with its pressurizing the face to be worked, and burnishing finish is performed. In that case, either one projection bar is faced to the direction crossed with the bus along the circumferential direction of the tool substrate at its side edge part, so the part receiving a plastic deformation in the face to be worked is moved in the axial direction of the tool substrate, therefore the burnishing finish is performed, by rotating the tool substrate so that the rotation phase of the tool at the same place differs on each rolling of the tool repeatedly.