Provided is a steel material which has excellent SSC resistance and a yield strength of 965-1,069 MPa (140 ksi class). A steel material according to the present disclosure has a chemical composition that contains, in mass%, 0.20-0.50% of C, 0.05-1.00% of Si, 0.05-1.00% of Mn, 0.025% or less of P, 0.0100% or less of S, 0.005-0.100% of Al, 0.20-1.50% of Cr, 0.25-1.50% of Mo, 0.002-0.050% of Ti, 0.0001-0.0050% of B, 0.0100% or less of N and 0.0100% or less of O, with the balance being made up of Fe and impurities. This steel material according to the present disclosure contains solid solution C in an amount of 0.010-0.050% by mass. This steel material according to the present disclosure has a yield strength of 965-1,069 MPa and a yield ratio of 90% or more.
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