Surface-coated cutting tool

A surface-coated cutting tool comprising:

• a substrate including a rake face and a flank face;
• a first coating film that coats the rake face;
• and
• a second coating film that coats the flank face, wherein
• the first coating film includes a first composite nitride layer at a region d1 on the rake face,
• the second coating film includes a second composite nitride layer at a region d2 on the flank face,
• The first composite nitride layer includes Ti1-x1-y1Alx1Tay1Cα1Nβ1, where each of x1, y1, α1 and β1 represents an atomic ratio, x1 satisfies 0.4≤x1≤0.6, y1 satisfies 0.01<y1<0.05, α1 satisfies 0≤α1≤0.4, α1+β1 satisfies 0.8≤α1'β1≤1.2,
• the second composite nitride layer includes Ti1-x2-y2Alx2Tay2Cα2Nβ2, where each of x2, y2, α2 and β2 represents an atomic ratio, x2 satisfies 0.45<x2<0.65, y2 satisfies 0.05≤y2≤0.1, α2 satisfies 0≤α2≤0.4, and α2+β2 satisfies 0.8≤α2+β2<1.2,
• in a case where the rake face and the flank face are connected via a cutting edge face, the region d1 is a region sandwiched between a boundary line between the rake face and the cutting edge face and an imaginary line D1 located on the rake face and separated by 200 μm from an imaginary ridgeline at which a plane obtained by extending the rake face crosses a plane obtained by extending the flank face, and the region d2 is a region sandwiched between a boundary line between the flank face and the cutting edge face and an imaginary line D2 located on the flank face and separated by 200 μm from the imaginary ridgeline, and
• in a case where the rake face and the flank face are connected via a ridgeline, the region d1 is a region sandwiched between the ridgeline and the imaginary line D1 located on the rake face and separated by 200 μm from the ridgeline, and the region d2 is a region sandwiched between the ridgeline and the imaginary line D2 located on the flank face and separated by 200 μm from the ridgeline.