<p>The present invention relates to a cutting tip and a diamond tool using the cutting tip. An object of the invention is to provide a cutting tip and a diamond tool, wherein a good initial cutting ability can be maintained while using the tool for an extended period of time, and a complicated dressing work therefor can be omitted, along with smooth discharge of the cutting chips and cooling water. In the cutting tip and the diamond tool of the invention for achieving the object, a concave groove is formed along a cutting direction at a leading end thereof that initially comes into contact with a workpiece when cutting the workpiece.</p>
