A nickel alloy with high-temperature oxidation resistance and excellent creep strength is provided. The nickel alloy comprises 11.5%-11.9% by mass Cr, 25%-29% by mass Co, 3.4%-3.7% by mass Mo, 1.9%-2.1% by mass W, 3.9%-4.4% by mass Ti, 2.9%-3.2% by mass Al, 0.02%-0.03% by mass C, 0.01%-0.03% by mass B, 0.04%-0.06% by mass Zr, 2.1%-2.2% by mass Ta, 0.3%-0.4% by mass Hf, 0.5%-0.8% by mass Nb, with the remainder comprising Ni and unavoidable impurities; and includes carbide and boride precipitated in the crystal grains and in the crystal grain boundaries.