ROTARY TOOL, AND MANUFACTURE THEREOF

PROBLEM TO BE SOLVED: To provide a rotary tool, bearable in use at a high speed in particular, and having strong strength, in a rotary tool using an inorganic long fiber as grinding and polishing elements. SOLUTION: This rotary tool is constituted, so that an inorganic long fiber 1 can be bound by a thermosetting resin binder, and the rotary tool can be worked by the fiber end of the inorganic long fiber 1. In this case, the inorganic long fiber 1 is a cylindrical body 3 formed by winding the fiber boundle 2 of the inorganic long fiber 1 on the outer periphery of a rotating body 10 while traversing, and at least one end surface of the cylindrical body 3 is formed of the cut surface of the cylindrical body 3.