Cutting tool cover, and a cutting apparatus cutting holder

Preventing scattering of particulate scraps. A cutting tool, which is carried out with respect to the cutting tool provided with the cover, the cutting tool body having a hollow shaft, the at least one insert member is mounted on one end face of the shaft body, while by making the shaft body is rotated while the insert abuts the workpiece so as to perform cutting. The cutting tool having a cover: a body portion, a front end portion fixed to the shaft body; and an extension portion with respect to the entire circumference of the distal end portion of the main body portion extending from the peripheral edge of the body portion to the outside, wherein a predetermined embodiment of a gap between the workpiece surface and the opposite surface of the workpiece and the body portion and the extension portion extending around the extension portion of the cutting tool and covers the surface of the workpiece.