This surface-coated cutting tool includes a tool body, a lower layer, and an upper layer, the lower layer consists of a W layer, a metal carbide layer, and a metal carbonitride layer, the W layer is formed from a surface of the tool body to an inside thereof over the surface to a depth of 10 to 500 nm, the metal carbide layer includes any one of Ti, Cr, Zr, Hf, Nb, and Ta and has an average layer thickness of 5 to 500 nm, the metal carbonitride layer includes a metal contained in the metal carbide layer and has an average layer thickness of 5 to 300 nm, the upper layer has an alternate laminated structure of an A layer and a B layer and has an average total layer thickness of 1.0 to 8.0 µm, 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 of (AlxCr1-x)N (0.40 ≤ x ≤ 0.80), and 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 of (Al1-a-b-c-dTiaCrbSicYd)N (0 ≤ a ≤ 0.40, 0.05 ≤ b ≤ 0.40, 0 ≤ c ≤ 0.20, and 0.01 ≤ d ≤ 0.10).
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机译：该表面涂覆的切削工具包括工具主体，下层和上层，下层由W层，金属碳化物层和金属碳氮化层组成，W层由表面形成工具主体在其内部的表面上到深度为10至500nm，金属碳化物层包括Ti，Cr，Zr，Hf，Nb和Ta中的任何一种，并且平均层厚度为5至500nm，金属碳氮化物层包括包含在金属碳化物层中的金属，并且具有5至300nm的平均层厚度，上层具有层和B层的交替层叠结构，并且平均总层厚度为1.0至8.0μm，每层的平均层厚度为0.1至5.0μm，并且层具有平均组成（Al x Cr 1-x ）n（0.40≤x≤0.80），B层每层的平均层厚度为0.1至5.0μm，B层具有平均组成（ Al 1-abcd ti a cr b si c y d ）n（ 0≤a≤0.40,0.05≤b≤0.40,0≤c≤0.20，0.01≤d≤0.10）。
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