Surface-coated cutting tool

A surface-coated cutting tool comprising:

• a tool body including a tungsten carbide-based cemented carbide;
• a lower layer provided on the tool body;
• and
• an upper layer provided on a surface of the lower layer and having an alternate laminated structure,
• wherein (a) the lower layer consists of a W layer, a metal carbide layer, and a metal carbonitride layer,
• (b) the W layer is for med from a surface of the tool body to an inside thereof over the surface to a depth of 10 to 500 nm,
• (c) a metal in the metal carbide layer is any one selected from the group consisting of Ti, Cr, Zr, Hf, Nb, and Ta, the metal carbide layer has an average layer thickness of 5 to 500 nm, and the metal carbide layer is formed directly on the W layer,
• (d) the metal carbonitride layer includes a metal component contained in the metal carbide layer, the metal carbonitride layer has an average layer thickness of 5 to 300 nm, and the metal carbonitride layer is formed directly on the metal carbide layer,
• (e) the upper layer has an alternate laminated structure in which at least one A layer and at least one B layer are alternately laminated, and the upper layer has an average total layer thickness of 1.0 to 8.0 μm,
• (f) the A layer is a composite nitride layer of Al and Cr, the A layer has an average layer thickness of 0.1 to 5.0 μm per one layer, and the A layer has an average composition satisfying 0.40≤x≤0.80 (where x is an atomic ratio), in a case where a composition of the A layer is represented by a composition formula:
• (AlxCr1-x)N, and
• (g) the B layer is a composite nitride layer of Al, Ti, Cr, Si, and Y, the B layer has an average layer thickness of 0.1 to 5.0 μm per one layer, and the B layer has an average composition satisfying 0≤a≤0.40, 0.05≤b≤0.40, 0≤c≤0.20, and 0.01≤d≤0.10 (where, all of a, b, c, and d are atomic ratios), in a case where a composition of the B layer is represented by a composition formula:
• (Al1-a-b-c-dTiaCrbSicYd)N.