Cutting tool

A cutting tool comprising a base material and a coating disposed on the base material, wherein

• the coating comprises a hard particle layer,
• the hard particle layer is formed from a plurality of hard particles including titanium, silicon, carbon, and nitrogen,
• in the hard particles, a concentration of the silicon periodically changes along a first direction set in the hard particles,
• an orientation of the hard particle layer is a (311) orientation, and the orientation of the hard particle layer that is the (311) orientation means that an orientation index TC(311) of a (311) plane in the hard particle layer among an orientation index TC(hkl) defined by an expression (1)
• T
• ⁢
• C
• ⁡
• (
• hk
• ⁢
• 1
• )
• =
• I
• ⁡
• (
• hk
• ⁢
• 1
• )
• I
• 0
• (
• hk
• ⁢
• 1
• )
• ⁢
• {
• 1
• 8
• ∑
• x
• ,
• y
• ,
• z
• I
• ⁡
• (
• h
• x
• ⁢
• k
• y
• ⁢
• 1
• z
• )
• I
• 0
• (
• h
• x
• ⁢
• k
• y
• ⁢
• 1
• z
• )
• }
• -
• 1
• (
• 1
• )
• is larger than respective orientation indices of a (111) plane, a (200) plane, a (220) plane, a (422) plane, a (331) plane, a (420) plane, and a (511) plane, where I(hkl) and I(hxkylz) represent a measured diffraction intensity of a (hkl) plane and a measured diffraction intensity of a (hxkylz) plane, respectively, I0(hkl) and I0(hxkylz) represent an average value of a powder diffraction intensity of TiC (card number:
• 32-1383) and TiN (card number:
• 38-1420) of the (hkl) plane according to JCPDS (Joint Committee on Powder Diffraction Standards) database and an average value of a powder diffraction intensity of TiC and TiN of the (hxkylz) plane according to the JCPDS database, respectively, and (hkl) and (hxkylz) each represent any of 8 planes of the (111) plane the (200) plane, the (220) plane, the (311) plane, the (331) plane, the (420) plane, the (422) plane, and the (511) plane.