To provide a cutting tool having performance similar to that of a brand-new article and capable of being inexpensively manufactured by reusing a shank making up the most part of the cutting tool approximately as it is.

A manufacturing method of the cutting tool having a blade unit 3 including a blade 1 having a cutting edge for cutting a material to be cut formed at the tip and having the shank 2 carried by a tool holder at a base end includes the steps of removing at least the blade from the cutting tool and then joining the blade unit 3 including the blade 1 having the cutting edge formed at the tip of the shank 2 of the cutting tool whose blade unit is removed, to thereby manufacture the cutting tool by reusing the shank 2.