Cutting tool

A cutting tool comprising:

• an attaching portion attached to a shank;
• a cutting portion having a core portion and a surface portion covering the core portion around a central axis;
• and
• a joint portion that joins the attaching portion and the cutting portion,
• the attaching portion including a hard component and a hard material,
• the hard component being at least one selected from the group consisting of TiC (titanium carbide), TiCN (titanium carbonitride), W (tungsten), WC (tungsten carbide), Al2O3 (alumina), and a combination of at least one of CBN (cubic boron nitride) and diamond and at least one of W and WC,
• the hard material including one or two or more types of iron group elements, and having a Young's modulus of not more than 350 GPa,
• the core portion including a cemented carbide material,
• the surface portion including PCD (polycrystalline diamond) or CBN,
• the cutting portion having a chamfer portion located at an end thereof opposite to the attaching portion,
• the surface portion including a groove, a flank face, and a cutting edge formed by a ridgeline between the groove and the flank face,
• the cutting edge extending from the end toward the attaching portion,
• the flank face being formed of a chamfer flank face located at the chamfer portion, and an outer circumferential flank face located at a portion other than the chamfer portion,
• inclination of the chamfer flank face with respect to the central axis being greater than inclination of the outer circumferential flank face with respect to the central axis.