A steel pipe for fuel injection pipe, the steel pipe having: a chemical composition consisting, by mass percent, of C: 0.12 to 0.27%, Si: 0.05 to 0.50%, Mn: 0.3 to 2.0%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, Ti: 0.005 to 0.040%, Nb: 0.015 to 0.045%, Cr: 0 to 1.0%, Mo: 0 to 1.0%, Cu: 0 to 0.5%, Ni: 0 to 0.5%, V: 0 to 0.15%, B: 0 to 0.005%, and the balance: Fe and impurities, and contents of Ca, P, S, and O in the impurities being Ca: 0.001% or less, P: 0.02% or less, S: 0.01% or less, and O: 0.0040% or less; a tensile strength of 500 to 900 MPa and a yield ratio of 0.50 to 0.85; and a circumferential-direction residual stress on an inner surface of the steel pipe is - 20 MPa or lower after the steel pipe is split in half in a pipe axis direction, wherein a critical internal pressure satisfying a following formula: IP ≥ 0.41 × TS × α α = D / d 2 − 1 / 0.776 × D / d 2 where, in the above formula (i), IP denotes the critical internal pressure (MPa) of the steel pipe, TS denotes the tensile strength (MPa) of the steel pipe, and α is a value expressed by the above formula (ii), and where, in the above formula (ii), D denotes an outer diameter (mm) of the steel pipe, and d denotes an inner diameter (mm) of the steel pipe, wherein the outer diameter and the inner diameter of the steel pipe satisfy a following formula (iii): D / d ≥ 1.5 where, in the above formula (iii), D denotes the outer diameter (mm) of the steel pipe, and d denotes the inner diameter (mm) of the steel pipe, and the critical internal pressure is a maximum internal pressure (MPa) within which no breakage or leakage occurs after 10 7 cycles of repetitive internal pressure fluctuations that follow a sine wave over time in an internal pressure fatigue test with a minimum internal pressure set at 18 MPa. a chemical composition consisting, by mass percent, of C: 0.12 to 0.27%, Si: 0.05 to 0.50%, Mn: 0.3 to 2.0%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, Ti: 0.005 to 0.040%, Nb: 0.015 to 0.045%, Cr: 0 to 1.0%, Mo: 0 to 1.0%, Cu: 0 to 0.5%, Ni: 0 to 0.5%, V: 0 to 0.15%, B: 0 to 0.005%, and the balance: Fe and impurities, and contents of Ca, P, S, and O in the impurities being Ca: 0.001% or less, P: 0.02% or less, S: 0.01% or less, and O: 0.0040% or less; a tensile strength of 500 to 900 MPa and a yield ratio of 0.50 to 0.85; and a circumferential-direction residual stress on an inner surface of the steel pipe is - 20 MPa or lower after the steel pipe is split in half in a pipe axis direction, wherein a critical internal pressure satisfying a following formula: IP ≥ 0.41 × TS × α α = D / d 2 − 1 / 0.776 × D / d 2 where, in the above formula (i), IP denotes the critical internal pressure (MPa) of the steel pipe, TS denotes the tensile strength (MPa) of the steel pipe, and α is a value expressed by the above formula (ii), and where, in the above formula (ii), D denotes an outer diameter (mm) of the steel pipe, and d denotes an inner diameter (mm) of the steel pipe, wherein the outer diameter and the inner diameter of the steel pipe satisfy a following formula (iii): D / d ≥ 1.5 where, in the above formula (iii), D denotes the outer diameter (mm) of the steel pipe, and d denotes the inner diameter (mm) of the steel pipe, and the critical internal pressure is a maximum internal pressure (MPa) within which no breakage or leakage occurs after 10 7 cycles of repetitive internal pressure fluctuations that follow a sine wave over time in an internal pressure fatigue test with a minimum internal pressure set at 18 MPa.