Coated cutting tool

A coated cutting tool comprising a substrate and a coating layer formed on the substrate, wherein

• the coating layer has a first alternately laminated structure in which two or more A layers and two or more B layers are alternately formed;
• the A layer contains a compound having a composition represented by a following formula (1):
• (AlaCrbTi1-a-b)N (1)
• (in the formula (1), a is a content (atomic ratio) of an Al element to a total of the Al element, a Cr element, and a Ti element, and satisfies 0.50≤a≤0.68;
• b is a content (atomic ratio) of the Cr element to the total of the Al element, the Cr element, and the Ti element, and satisfies 0.02≤b≤0.30;
• and
• 1−a−b is a content (atomic ratio) of the Ti element to the total of the Al element, the Cr element, and the Ti element, and satisfies 0.11≤1−a−b≤0.40);
• the B layer contains a compound having a composition represented by a following formula (2):
• (AlcTi1-c-dBd)N (2)
• (in the formula (2), c is a content (atomic ratio) of the Al element to a total of the Al element, the Ti element, and a B element, and satisfies 0.30≤c≤0.64;
• d is a content (atomic ratio) of the B element to the total of the Al element, the Ti element, and the B element, and satisfies 0.01≤d≤0.10;
• and
• 1−c−d is a content (atomic ratio) of the Ti element to the total of the Al element, the Ti element, and the B element, and satisfies 0.30≤1−c−d≤0.69);
• an average thickness of the first alternately laminated structure is 0.50 μm or more and 10.00 μm or less;
• an average thickness per layer of the A layer in the first alternately laminated structure is 2 nm or more and 300 nm or less;
• and
• an average thickness per layer of the B layer in the first alternately laminated structure is 2 nm or more and 300 nm or less.