A fuel injection control apparatus is included in an internal combustion engine including an intake passage injection valve (22) and a cylinder injection valve (21) and being capable of switching between an MP1 mode and a DI + MPI mode based on an operating state of the engine (1). The fuel injection control apparatus includes an injection amount control unit including a direct-combustion-rate calculation unit (33) calculating a DI direct combustion rate αdi that is the rate of that portion of the amount of DI injection Fdi which corresponds to a fuel combusted instead of adhering to inside of the cylinder, and a cylinder vaporization rate calculation unit (34) calculating a cylinder vaporization rate Z that is the rate of the amount of that portion of the fuel adhering to the inside of the cylinder which vaporizes. The injection amount calculation unit (32) controls fuel injection based at least on the DI direct combustion rate αdi and the cylinder vaporization rate. When the engine is switched between the MPI mode and the DI + MPI mode, the injection amount calculation unit (32) corrects the DI direct combustion rate αdi or the cylinder vaporization rate Z to set the amount of fuel injection to a value different from a value set in a case where the fuel injection modes are maintained.