To provide a cutting tool having a cutting edge changing type medium and small diameter cutting tool and allowing a cutting tool edge part to be fixed to a shank with good accuracy in the axial and radial directions and with high rigidity.

In this cutting edge changing cutting tool formed by a tool main body having a connecting shaft body integrally formed at the rear part of the edge part, and a shank part removably connected to the tool main body, a fitting shaft part concentrically provided on the connecting shaft part and a fitting hole part concentrically provided on the shank side are mutually fitted, the edge part is a cemented carbide single body of ultra-fine particles WC with a mean particle diameter of 1 micron or smaller, and the Young's modulus is 550 GPa or larger.