Hard coating and hard-coating-covered member

A hard coating that is to be adhered to a surface of a substrate so as to cover the surface of the substrate, wherein

• the hard coating has a total thickness of a range of 0.5-20 μm and includes three kinds of layers that are alternately laminated, wherein the three kinds of layers consist of a single composition layer and two kinds of nanolayer-alternated layers, wherein the single composition layer is constituted by one of an A composition, a B composition and a C composition, and wherein the two kinds of nanolayer-alternated layers include nanolayers which are alternately laminated and which are constituted by two of three combinations consisting of a combination of the A composition and the B composition, a combination of the A composition and the C composition and a combination of the B composition and the C composition, such that the nanolayers included in one of the two kinds of nanolayer-alternated layers are constituted by one of the two of the three combinations, and such that the nanolayers included in the other of the two kinds of nanolayer-alternated layers are constituted by the other of the two of the three combinations;
• the A composition is a nitride that is represented by a composition formula of Ala Crb Sic αd, wherein atomic ratios a, b, c, d satisfy 0.30≤a≤0.85, 0.10≤b≤0.65, 0.01≤c≤0.45, 0≤d≤0.10 and a+b+c+d=1, and wherein an optional additive component α is at least one kind of element selected from B, C, Ti, V, Y, Zr, Nb, Mo, Hf, Ta and W;
• the B composition is a nitride that is represented by a composition formula of Ale Tif Sig βh, wherein atomic ratios e, f, g, h satisfy 0.01≤e≤0.85, 0.05≤f≤0.90, 0.05≤g≤0.45, 0≤h≤0.10 and e+f+g+h=1, and wherein an optional additive component β is at least one kind of element selected from B, C, Cr, V, Y, Zr, Nb, Mo, Hf, Ta and W;
• the C composition is a nitride that is represented by a composition formula of Ali Crj (SiC)k γl, wherein atomic ratios i, j, k, l satisfy 0.20≤i≤0.85, 0.10≤j≤0.50, 0.03≤k≤0.45, 0≤l≤0.10 and i+j+k+1=1, and wherein an optional additive component γ is at least one kind of element selected from B, Ti, V, Y, Zr, Nb, Mo, Hf, Ta and W;
• the single composition layer has a thickness of a range of 0.5-1000 nm;
• and
• each of the nanolayers constituting the two kinds of nanolayer-alternated layers has a thickness of a range of 0.5-500 nm, and each of the two kinds of nanolayer-alternated layers has a thickness of a range of 1-1000 nm.