To provide a rotating body for loosening, of which blade part directly associated with the loosening is rich in mechanical durability, and easily exchanging a broken blade.

This rotating body for scratch loosening having projections on its surface used for producing a cotton like material by scratch-loosening a continuous body of a material to be loosened is provided with that the scratch-loosening part of the rotating body is constituted by an aggregate of discs having a saw teeth-formed projections having a raking angle, and also the saw teeth like projections are arranged as a spiral state on the surface of the rotating body in its rotary shaft direction, or the discs are arranged by having a slope against the rotary shaft of the rotating body.