A polycrystal diamond fluted tool which is capable of effecting working with much higher accuracy and longer life as compared with the sintered diamond straight flute tool of the prior art, and is particularly suitable for finishing working with high accuracy is provided by forming a polycrystal diamond film (3, 4, 5) on the surface of a substrate subjected to helical grinding by a vapor phase synthesis method, then subjecting the product to a chemical treatment to dissolve and remove only the substrate, brazing the resulting polycrystal diamond film (3, 4, 5) in a fluted form to at least a part of the rake face (2) of a tool base metal (1) subjected to helical grinding in the similar manner to the substrate and then subjecting the brazed tool base metal to working of a flank face to form a cutting edge.
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