Fuel injection control system

The fuel injection control system (10) is configured to suppress output change of an engine even when the number of fuel injections changes. In a case where the number of fuel injections is switched from one to two, an injection timing is gradually advanced with the number of fuel injections in one cycle kept at one, until the injection timing is shifted to a first predetermined stage. When the injection timing is shifted to the first predetermined injection stage, the number of fuel injections is set to two, the first injection timing is set in the first predetermined injection stage, and an additional injection timing is set in a second predetermined injection stage. In a case where the number of fuel injections is switched from two to one, the number of fuel injections is set to one and the injection timing is gradually delayed until the injection timing is shifted to a third predetermined injection stage.