Cutting tool

A cutting tool comprising a base and a diamond layer covering the base,

• wherein the cutting tool has a rake face and a flank face, the flank face being contiguous to the rake face,
• wherein a ridgeline between the rake face and the flank face constitutes a cutting edge,
• wherein the diamond layer includes a flank-face covering portion constituting the flank face,
• wherein a thickness of the flank-face covering portion is 10 μm to 25 μm,
• wherein, in a cross-section perpendicular to a tangent line of the cutting edge, a radius of curvature of the cutting edge is less than a value obtained by multiplying the thickness of the flank-face covering portion by 0.3,
• wherein the rake face includes a first portion constituted of the flank-face covering portion, the first portion being contiguous to the flank face, and
• wherein a maximum height roughness of the first portion is less than 2 μm.