PURPOSE: To manufacture a high-performance, high processing accuracy and long life rotational cutting tool at a low cost which is capable of brazing on the tool body a bed plate less helical chip composed of a superhigh pressure sintered body and having its cutting edge composed of a large helix angular superhigh pressure sintered body helical chip.

CONSTITUTION: Adherence of a superhigh pressure sintered body chip 1 not containing a bed plate to a tool body 2 is accomplished by a method of brazing in a vacuum, using a Ti inclusion active silver solder material. This method allows the chip 1 to solidly adhere to the tool body 2 through an adhesive layer 3 of the Ti inclusion active silver solder material and chip is never removed even if it is a helical chip. Since the bed plate is dispensable, improvement of chip manufacturing yield rate and manufacturing efficiency, reduction of tool machining cost, improvement of productivity, and the like can be realized.