To provide a cutting tool for elongating a service life of the tool for cutting and machining a titanium alloy.

The cutting tool is a throwaway tip 1 suitable for machining the titanium alloy having a structure in which a main surface is formed into a roughly plane shape in a rough polygon, the main surface forms a cutting face 2, a side face forms a flank 3, an intersecting ridge line between the cutting face 2 and the flank 3 forms a cutting blade 4, a corner of the roughly polygon-shaped main surface forms a nose 5, the cutting blade 4 of the nose 5 forms a nose cutting blade 4a, the cutting blade 4 positioned at an edge of the main surface in the rough polygon excepting the nose cutting blade 4a forms a straight line cutting blade 4b, at least a honing that is larger than the nose cutting blade 4a is formed at the straight line cutting blade 4b, the straight line cutting blade 4b is constituted of a base body 7 that is formed of cemented carbide and coated with a coating layer 8, and the nose cutting blade 4a is constituted of the base body 7 that is not coated with the coating layer 8.