Cutting tool, manufacturing method of cutting tool, and manufacturing method of cut work using cutting tool

摘要

A cutting tool according to one embodiment of the present invention is a cutting tool made of a cemented carbide containing cobalt and provided with a columnar body part rotated around a central axis and at least one of a tip part and an outer peripheral part of the body part A chip discharge groove extending from the cutting edge toward the rear end of the main body portion, and a covering layer made of diamond covering the cutting edge, wherein in the portion of the main body portion covered with the covering layer The content of cobalt is smaller than the cobalt content in the surface of the main body except for the part covered with the covering layer.