Ni-based superalloy and oxidation characteristics evaluation method

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An Ni-based superalloy not containing Co, Mo, and Hf, wherein the Ni-based superalloy is characterized in having a composition containing Cr in an amount of 7.0 to 11.0% by weight inclusive, W in an amount of 6.0 to 10.0% by weight inclusive, Al in an amount of 4.5 to 6.5% by weight inclusive, Nb in an amount of 0.2 to 5.0% by weight inclusive, Nb and Ta in an amount of 6.0 to 11.0% by weight inclusive, Re in an amount of 0.1 to less than 2.5% by weight, and Si in an amount of 0.03 to 1.0% by weight inclusive; and in which Ni and inevitable impurities constitute the balance.