Surface-coated cutting tool

A surface-coated cutting tool comprising:

• a substrate;
• and
• a covering layer formed on the substrate,
• wherein the covering layer includes one or two or more sublayers,
• a thickness T1 of a portion of the covering layer having the smallest thickness in a cutting edge line portion and a thickness T2 of the covering layer at a point 1 mm away from a cutting edge line in a rake face direction in a cross section of the surface-coated cutting tool cut by a plane containing a line normal to a surface of the covering layer at the center of a rake face and an edge line at which two flank faces intersect satisfy T1 <T2, and
• a point a on the surface of the covering layer a distance Da away from the cutting edge line in the rake face direction and a point b on the surface of the covering layer a distance Db away from the cutting edge line in a flank face direction satisfy 0.05 mm ≦Da ≦0.5 mm and 0.01mm ≦Db ≦0.2 mm, and in 10% or more of a region E of the covering layer having a thickness in the range of 0.1T1 to 0.9T1 from the surface and extending from the point a to the point b, the deviation in the crystal orientation of crystal grains constituting the covering layer is 5 degrees or more and less than 10 degrees.