CUTTING TOOL

A cutting tool with sufficient stiffness of a body is provided.A cutting tool 10 includes a body 100 in which a discharge groove 120 for guiding and discharging chips is formed, and a cutting insert 200 fastened and fixed on a distal end side of the body 100. The cutting insert 200 includes a first surface 210 through which a through-hole 230 is opened, and a major cutting edge 231 formed so as to extend straight at an end part of the first surface 210. A protrusion portion 130 protruding so as to cover part of the first surface 210 of the cutting insert 200 from outside is formed at the body 100. A clearance hole 170 is formed so as to extend from a surface of the body 100 opposite the cutting insert 200 toward a corner cutting edge 242 when viewed from the distal end side along a central axis AX1.