a base; and

a coating disposed on the base, wherein

the coating includes a first layer, wherein

the first layer is composed of α-Al₂O₃,

a thickness of the first layer is 2 μm or more and 15 μm or less,

on a cross section along a normal line of an interface between the base and the coating, a ratio N2/N1 is 0.60 or more, wherein the ratio N2/N1 is a ratio of: a number N2 of second grain boundaries that are grain boundaries with an absolute value of an angle relative to a straight line perpendicular to an imaginary line L1 of 15° or less at a position where a first grain boundary and imaginary line L1 intersect in the first grain boundaries; relative to a number N1 of the first grain boundaries through which imaginary line L1 crosses, wherein imaginary line L1 has the same distances from a surface of the first layer or an interface, on a surface side of the coating, of the first layer and from an interface, on a side of the base, of the first layer, and

on the cross section along the normal line of the interface between the base and the coating, a ratio N4/N3 and the ratio N2/N1 satisfy a relationship of a following Formula 1, wherein the ratio N4/N3 is a ratio of: a number N4 of fourth grain boundaries that are grain boundaries with an absolute value of an angle relative to a straight line perpendicular to an imaginary line L2 of 15° or less at a position where a third grain boundary and imaginary line L2 intersect in the third grain boundaries; relative to a number N3 of the third grain boundaries through which imaginary line L2 crosses, wherein imaginary line L2 has a distance of 0.5 μm from the surface of the first layer or the interface, on the surface side of the coating, of the first layer toward a side of the base,