CUTTING TOOL

WIPO Patent Application WO/2023/243007

A1

This cutting tool comprises a base material and a coating provided on the base material, wherein: the coating includes a first layer; the first layer has a multilayer structure in which first unit layers and second unit layers are stacked alternately; a thickness of each first unit layer is at least equal to 2 nm and less than 50 nm; a thickness of each second unit layer is at least equal to 2 nm and less than 50 nm; a thickness of the first layer is 1.0 μm to 20 μm inclusive; the first unit layers comprise TiaAlbBcN and the second unit layers comprise TidAleBfN, where the following relationships are satisfied, 0.54≤a≤0.75, 0.24≤b≤0.45, 0