To solve problems with a threading tool that grinding liquid cannot be consistently fed to a threading part, and the dimensional accuracy of a screw-shaped groove and the tool lifetime are degraded.

A threading tool has a fixing part 5 to be mounted to a machine tool on an upper end of a columnar body, and a threading part 4 having a plurality of annular projecting/recessed parts 3 on an outer circumferential surface of a lower end thereof at a predetermined pitch. A plurality of slits 2 are formed in the outer circumferential surface of the fixing part 5 in the axial direction of the columnar body.