A cutting tool for cutting a rotationally symmetrical surface of a rotating workpiece , the cutting including the step of feeding the cutting tool in a direction inclined with respect to a rotational axis of the rotationally symmetrical surface while holding the cutting tool in contact with the rotationally symmetrical surface , in the step of feeding the cutting tool , the cutting tool having a point (P) being in contact with the rotationally symmetrical surface , the point shifting as the cutting tool is fed, the cutting tool comprising: a rake face ; a flank face ; and a cutting edge connecting the rake face and the flank face , the cutting edge as seen from above the flank face having a shape including at least one arc, the arc having a radius of curvature of not less than 100 mm and not more than 500 mm, characterized in that the cutting edge as seen from above the flank face further includes: a first end having a convex shape, the first end corresponding to an end which contacts to the rotationally symmetrical surface at a start of cutting the rotating workpiece ; and a second end opposite the first end and having a convex shape, the second end corresponding to an end which contacts to the rotationally symmetrical surface at an end of cutting the rotating workpiece , and the first end and the second end each having a radius of curvature smaller than the radius of curvature of the arc, and the flank face , as seen from above the flank face, having a shape tapering from the first and second ends toward a back surface opposite to the rake face . in the step of feeding the cutting tool , the cutting tool having a point (P) being in contact with the rotationally symmetrical surface , the point shifting as the cutting tool is fed, the cutting tool comprising: a rake face ; a flank face ; and a cutting edge connecting the rake face and the flank face , a rake face ; a flank face ; and a cutting edge connecting the rake face and the flank face , the cutting edge as seen from above the flank face having a shape including at least one arc, the arc having a radius of curvature of not less than 100 mm and not more than 500 mm, characterized in that the cutting edge as seen from above the flank face further includes: a first end having a convex shape, the first end corresponding to an end which contacts to the rotationally symmetrical surface at a start of cutting the rotating workpiece ; and a second end opposite the first end and having a convex shape, the second end corresponding to an end which contacts to the rotationally symmetrical surface at an end of cutting the rotating workpiece , and a first end having a convex shape, the first end corresponding to an end which contacts to the rotationally symmetrical surface at a start of cutting the rotating workpiece ; and a second end opposite the first end and having a convex shape, the second end corresponding to an end which contacts to the rotationally symmetrical surface at an end of cutting the rotating workpiece , and the first end and the second end each having a radius of curvature smaller than the radius of curvature of the arc, and the flank face , as seen from above the flank face, having a shape tapering from the first and second ends toward a back surface opposite to the rake face . <EOS>