Electric resistance welded oil country tubular goods comprising: a chemical composition that contains, in mass%, C: 0.05 to 0.12%, Si: 0.03 to 0.5%, Mn: 0.80 to 2.2%, P: 0.03% or less, S: 0.003% or less, Al: 0.08% or less, Nb: 0.01% to 0.10%, Ti: 0.005 to 0.03%, B: 0.0005 to 0.0030%, and N: 0.008% or less, optionally one type or two types or more selected from, in mass%, Ni: 1% or less, Cu: 1% or less, Mo: 0.3% or less, Cr: 0.8% or less, V: 0.1 % or less, and Ca: 0.0060% or less, and in which Ti > 3.4 N is satisfied, its balance is composed of Fe and inevitable impurities, and V C90 defined by Expression below is 15 to 40, where a C content (%) is represented by, an Si content (%) is represented by [Si], an Mn content (%) is represented by [Mn], an Ni content (%) is represented by [Ni], a Cu content (%) is represented by [Cu], a Cr content (%) is represented by [Cr], and a Mo content (%) is represented by [Mo], wherein a structure of the electric resistance welded oil country tubular goods other than a structure of an electric resistance welded portion is made of a bainite uniform structure, and wherein the electric resistance welded oil country tubular goods have a yield stress of 758 to 965 MPa and a tensile strength of 862 MPa or more, a yield to tensile ratio of 85% to 95% and the electric resistance welded oil country tubular goods do not have yield point elongation in a test result of a tensile test. logV C 90 = 2.94 − 0.75 2.7 C + 0.4 Si + Mn + 0.45 Ni + 0.45 Cu + 0.8 Cr + 2 Mo a chemical composition that contains, in mass%, C: 0.05 to 0.12%, Si: 0.03 to 0.5%, Mn: 0.80 to 2.2%, P: 0.03% or less, S: 0.003% or less, Al: 0.08% or less, Nb: 0.01% to 0.10%, Ti: 0.005 to 0.03%, B: 0.0005 to 0.0030%, and N: 0.008% or less, optionally one type or two types or more selected from, in mass%, Ni: 1% or less, Cu: 1% or less, Mo: 0.3% or less, Cr: 0.8% or less, V: 0.1 % or less, and Ca: 0.0060% or less, and in which Ti > 3.4 N is satisfied, its balance is composed of Fe and inevitable impurities, and V C90 defined by Expression below is 15 to 40, where a C content (%) is represented by, an Si content (%) is represented by [Si], an Mn content (%) is represented by [Mn], an Ni content (%) is represented by [Ni], a Cu content (%) is represented by [Cu], a Cr content (%) is represented by [Cr], and a Mo content (%) is represented by [Mo], wherein a structure of the electric resistance welded oil country tubular goods other than a structure of an electric resistance welded portion is made of a bainite uniform structure, and wherein the electric resistance welded oil country tubular goods have a yield stress of 758 to 965 MPa and a tensile strength of 862 MPa or more, a yield to tensile ratio of 85% to 95% and the electric resistance welded oil country tubular goods do not have yield point elongation in a test result of a tensile test. logV C 90 = 2.94 − 0.75 2.7 C + 0.4 Si + Mn + 0.45 Ni + 0.45 Cu + 0.8 Cr + 2 Mo C: 0.05 to 0.12%, Si: 0.03 to 0.5%, Mn: 0.80 to 2.2%, P: 0.03% or less, S: 0.003% or less, Al: 0.08% or less, Nb: 0.01% to 0.10%, Ti: 0.005 to 0.03%, B: 0.0005 to 0.0030%, and N: 0.008% or less, optionally one type or two types or more selected from, in mass%, Ni: 1% or less, Cu: 1% or less, Mo: 0.3% or less, Cr: 0.8% or less, V: 0.1 % or less, and Ca: 0.0060% or less, and in which Ti > 3.4 N is satisfied, its balance is composed of Fe and inevitable impurities, and V C90 defined by Expression below is 15 to 40, where a C content (%) is represented by, an Si content (%) is represented by [Si], an Mn content (%) is represented by [Mn], an Ni content (%) is represented by [Ni], a Cu content (%) is represented by [Cu], a Cr content (%) is represented by [Cr], and a Mo content (%) is represented by [Mo], wherein a structure of the electric resistance welded oil country tubular goods other than a structure of an electric resistance welded portion is made of a bainite uniform structure, and wherein the electric resistance welded oil country tubular goods have a yield stress of 758 to 965 MPa and a tensile strength of 862 MPa or more, a yield to tensile ratio of 85% to 95% and the electric resistance welded oil country tubular goods do not have yield point elongation in a test result of a tensile test. logV C 90 = 2.94 − 0.75 2.7 C + 0.4 Si + Mn + 0.45 Ni + 0.45 Cu + 0.8 Cr + 2 Mo