A fuel injection control apparatus in an internal combustion engine, the engine having cylinders (11A, 11B, 11C, 11D), fuel injection portions (13A, 13B, 13C, 13D), and a signal rotor, the fuel injection portions (13A-13D) inject fuel to be burned in the cylinders (11A-11D), the signal rotor having a no-tooth portion and a plurality of tooth portions (E0-E32), and the tooth portions (E0-E32) including a following tooth portion that is arranged adjacent to and follows the no-tooth portion, the control apparatus comprising: a signal output portion (31, 32) outputting signals in correspondence to respective detections of the tooth portions (E0-E32) and the no-tooth portion; and a control portion controlling the fuel injection portions (13A-13D) in such a manner as to inject the fuel after a preset waiting period [Θo, (Θo + αc)] has elapsed, the preset waiting period (Θo, (Θo + αc)] being previously set on the basis of the signal, and wherein a time point (ΘΔ), at which the signal output portion (31, 32) actually outputs a signal indicating a start point or an end point of a detection of the no-tooth portion or a start point or an end point of the detection of the following tooth portion, is deviated due to the existence of the no-tooth portion, the control apparatus being characterized by a correcting portion that corrects the preset waiting period [Θ, Θ + αc] by an amount corresponding to the deviation (ΔΘ) in the case that the control portion controls the fuel injection portion in such a manner as to inject the fuel after a preset waiting period [Θ, Θ + αc], which has been previously set on the basis of the signal corresponding to the detection of the start point [Θ, Θ01] or the end point [Θ332, Θ02] has elapsed, wherein the preset waiting period [Θ, Θ + αc] is corrected on the basis of the signal output from the signal output portion (31, 32) at a time point when the engine turns by 360 deg. from the detection of the no-tooth portion, and the preset waiting period [Θ, Θ + αc] is set on the basis of the start point (Θ01) or the end point (Θ02) of the detection of the following tooth portion. a signal output portion (31, 32) outputting signals in correspondence to respective detections of the tooth portions (E0-E32) and the no-tooth portion; and a control portion controlling the fuel injection portions (13A-13D) in such a manner as to inject the fuel after a preset waiting period [Θo, (Θo + αc)] has elapsed, the preset waiting period (Θo, (Θo + αc)] being previously set on the basis of the signal, and wherein a time point (ΘΔ), at which the signal output portion (31, 32) actually outputs a signal indicating a start point or an end point of a detection of the no-tooth portion or a start point or an end point of the detection of the following tooth portion, is deviated due to the existence of the no-tooth portion, the control apparatus being characterized by a correcting portion that corrects the preset waiting period [Θ, Θ + αc] by an amount corresponding to the deviation (ΔΘ) in the case that the control portion controls the fuel injection portion in such a manner as to inject the fuel after a preset waiting period [Θ, Θ + αc], which has been previously set on the basis of the signal corresponding to the detection of the start point [Θ, Θ01] or the end point [Θ332, Θ02] has elapsed, wherein the preset waiting period [Θ, Θ + αc] is corrected on the basis of the signal output from the signal output portion (31, 32) at a time point when the engine turns by 360 deg. from the detection of the no-tooth portion, and the preset waiting period [Θ, Θ + αc] is set on the basis of the start point (Θ01) or the end point (Θ02) of the detection of the following tooth portion.