Coated cutting tool

A coated cutting tool which comprises a substrate and a coating layer formed onto a surface of the substrate, wherein

• the coating layer contains a hard layer having a composition represented by (TixM1-x)N that satisfies 0.45≤x≤0.9, wherein M represents at least one kind of an element selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and Y, and x represents an atomic ratio of a Ti element based on a sum of the Ti element and an M element,
• an average grain size of grains comprising the hard layer is 200 nm or more and 600 nm or less, and
• a value Sa in area % satisfies 55 area % ≤Sa≤90 area % under conditions such that
• (i) the hard layer is polished in a direction substantially parallel to the surface of the substrate to obtain a polished surface,
• (ii) an angle formed by a normal line of the polished surface and a normal line at a cubic (311) plane of the grains of the hard layer is determined as an orientation difference,
• (iii) A is an area of a cross-section of the grains of the hard layer where orientation differences of the grains are within a range of 0° or more and 35° or less,
• (iv) B is an area of a cross-section of the grains of the hard layer where orientation differences of the grains are within a range of 0° or more and less than 15° , and
• (v) Sa is computed in terms of a total of the area A and a total of the area B as Sa=B/A×100.