An Ni3Al-base heat-resistant alloy containing, in %by weight,6.0 to 9.0% of Al, 2.0 to 15.0% of Cr and 0.5 to3.0% of Zr, the balance being Ni and inevitable impurities,the alloy having a metal structure comprising Ni3Al as themain phase thereof. When required, the alloy may furthercontain over 0% to not more than 5.0% of W, over 0% to not morethan 3.0% of Mo, over 0% to not more than 3.0% of Nb, over 0%to not more than 0.003% of B, over 0% to not more than 0.3% ofC and 0.003 to 0.03% of N, wherein the combined amount of W, Moand Nb is up to 5.0% if at least two of these elements arepresent.
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