Diamond-coated tool and method of manufacturing diamond-coated tool

A diamond-coated tool provided with a blade which includes a base material and a diamond layer formed on the base material,

• wherein a length of the blade along an extending direction thereof is denoted by L, and a thickness of the diamond layer of the blade is measured at a total number of 11 points which are arranged from one end of the blade along the extending direction thereof and separated from each other at an interval of L/10, the thickness being the same at all of the 11 points, or a ratio dmin/dmax between a minimum value dmin of the thickness and a maximum value dmax of the thickness being 0.7 or more and less than 1, and
• wherein a Raman spectrum of the diamond layer in the range of Raman shift 900 cm−1 to 2000 cm−1 is measured at a first point where the thickness has a minimum value dmin and a second point where the thickness has a maximum value dmax,
• a ratio Imin/Imax between Imin, which is a ratio Idmin/Ismin at the first point between a peak area intensity Idmin of diamond and an area intensity Ismin of the entire spectrum, and Imax, which is a ratio Idmax/Ismax at the second point between a peak area intensity Idmax of diamond and an area intensity Ismax of the entire spectrum, is 0.7 or more and 1 or less.