A Ni-Cr alloy material has a chemical composition that consists of; Si: 0.01 to 0.5%, Mn: 0.01 to less than 1.0%, Cu: 0.01 to less than 1.0%, Ni: 48 to less than 55%, Cr: 22 to 28%, Mo: 5.6 to less than 7.0%, N: 0.04 to 0.16%, sol.Al: 0.03 to 0.20%, REM: 0.01 to 0.074%, W: 0% or more and less than 8.0%, Co: 0 to 2.0%; one or more of Ca and Mg: 0.0003 to 0.01% in total, and one or more of Ti, Nb, Zr, and V: 0 to 0.5% in total, the balance thereof being Fe and impurities, and the impurities include C ≤ 0.03%, P ≤ 0.03%, S ≤ 0.001%, and O ≤ 0.01%. The dislocation density ρ of the Ni-Cr alloy material expressed in m -2 satisfies a formula [7.0 × 10 15 ≤ ρ ≤2.7 × 10 16 - 2.67 × 10 17 × REM]. This Ni-Cr alloy material is excellent in hot workability and toughness, and also in corrosion resistance in an environment being at high temperatures more than 200°C and including H 2 S.