Cutting tool

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

• the coating comprises a first layer;
• the first layer has a multilayer structure in which a first unit layer and a second unit layer are alternately stacked;
• a thickness of the first unit layer is 2 nm or more and 50 nm or less;
• a thickness of the second unit layer is 2 nm or more and 50 nm or less;
• a thickness of the first layer is 1.0 μm or more and 20 μm or less,
• the first unit layer is composed of TiaAlbBcN, and
• the second unit layer is composed of TidAleBfN,
• wherein
• 0.49≤a≤0.70,
• 0.19≤b≤0.40,
• 0.10≤c≤0.20,
• a+b+c=1.00,
• 0.39≤d≤0.60,
• 0.29≤e≤0.50,
• 0.10<f≤0.20,
• d+e+f=1.00,
• 0.05≤a−d≤0.20, and
• 0.05≤e−b≤0.20 are satisfied, and
• a percentage of the number of atoms of titanium to the total number of atoms of titanium, aluminum and boron is 45% or more in the first layer.