A cutting tool including a base material and a coating formed on the base material, wherein said base material is a sintered body containing 30 to 80 % by volume of cubic boron nitride, and a binder, said binder contains at least one compound formed of at least one element selected from the group consisting of group IV elements, group V elements, and group VI elements of Periodic Table, and aluminum, and at least one element selected from the group consisting of boron, carbon, nitrogen, and oxygen, a surface in contact with said coating, of said base material, has a plurality of convex portions made of said cubic boron nitride projecting out and a plurality of concave portions in said binder, wherein said concave portions are formed by selective etching said binder rather than said cubic boron nitride by ion bombardment process, said coating is polished and includes at least one layer having a composition of M1 x L1 y, where x and y represent an atom ratio of 0 < x ≤ 1.2 and y = 1 respectively, M1 is at least one element selected from the group consisting of group IV elements, group V elements, and group VI elements of Periodic Table, aluminum, and silicon, and L1 is at least one element selected from the group consisting of boron, carbon, nitrogen, and oxygen, a surface roughness Rsub of the surface in contact with said coating, of said base material, is 0.1 to 0.4 μm, a surface roughness Rsurf of an outermost surface of said coating is 0 to 0.15 μm, a surface roughness Rasurf of said outermost surface of said coating is 0 to 0.1 μm, and the surface roughness Rsub of the surface in contact with said coating, of said base material, is greater than the surface roughness Rsurf of said outermost surface of said coating, the surface roughness Rsub represents the surface roughness R of the surface contact with said coating, of said base material, measured by means of a scanning electron microscope, the surface roughness Rsurf represents the surface roughness R of said outermost surface of said coating, measured by means of said scanning electron microscope, and the surface roughness Rasurf represents the surface roughness Ra of said outermost surface of said coating, measured by means of a stylus profilometer, and a thickness of said coating is 0.2 to 10 μm. said base material is a sintered body containing 30 to 80 % by volume of cubic boron nitride, and a binder, said binder contains at least one compound formed of at least one element selected from the group consisting of group IV elements, group V elements, and group VI elements of Periodic Table, and aluminum, and at least one element selected from the group consisting of boron, carbon, nitrogen, and oxygen, a surface in contact with said coating, of said base material, has a plurality of convex portions made of said cubic boron nitride projecting out and a plurality of concave portions in said binder, wherein said concave portions are formed by selective etching said binder rather than said cubic boron nitride by ion bombardment process, said coating is polished and includes at least one layer having a composition of M1 x L1 y, where x and y represent an atom ratio of 0 < x ≤ 1.2 and y = 1 respectively, M1 is at least one element selected from the group consisting of group IV elements, group V elements, and group VI elements of Periodic Table, aluminum, and silicon, and L1 is at least one element selected from the group consisting of boron, carbon, nitrogen, and oxygen, a surface roughness Rsub of the surface in contact with said coating, of said base material, is 0.1 to 0.4 μm, a surface roughness Rsurf of an outermost surface of said coating is 0 to 0.15 μm, a surface roughness Rasurf of said outermost surface of said coating is 0 to 0.1 μm, and the surface roughness Rsub of the surface in contact with said coating, of said base material, is greater than the surface roughness Rsurf of said outermost surface of said coating, the surface roughness Rsub represents the surface roughness R of the surface contact with said coating, of said base material, measured by means of a scanning electron microscope, the surface roughness Rsurf represents the surface roughness R of said outermost surface of said coating, measured by means of said scanning electron microscope, and the surface roughness Rasurf represents the surface roughness Ra of said outermost surface of said coating, measured by means of a stylus profilometer, and a thickness of said coating is 0.2 to 10 μm.