Tool and coated tool

A tool in which at least part of a cutting edge thereof comprises a sintered body containing cubic boron nitride, wherein:

• the sintered body integrally and inseparably comprises an inner region and a binder phase enriched layer formed on at least part of a surface of the inner region;
• the inner region comprises:
• 15 volume % or more to 90 volume % or less of cubic boron nitride;
• and 10 volume % or more to 85 volume % or less of a mixture of a binder phase and impurities;
• the binder phase enriched layer comprises:
• 90 volume % or more to 100 volume % or less of the mixture of the binder phase and the impurities;
• and 0 volume % or more to 10 volume % or less of cubic boron nitride;
• and
• the binder phase contains at least one kind selected from the group consisting of:
• an element of at least one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Co, Ni and Si;
• and a compound of the element and an element of at least one kind selected from the group consisting of C, N, O and B.