FUEL INJECTION CONTROL DEVICE

A fuel injection control device includes a conduction time calculation unit, a detection unit, an estimation unit, a correction unit, a sudden change determination unit, and a reflection speed setting unit. The detection unit detects a physical quantity having a correlation with an actual injection quantity during the partial lift injection. The estimation unit estimates the actual injection quantity on the basis of a detection result of the detection unit. The correction unit corrects the requested injection quantity by a correction quantity corresponding to a deviation between the actual injection quantity and the requested injection quantity. The sudden change determination unit determines whether or not the correction quantity is in a sudden change state on the basis of whether or not the correction quantity has changed from a previous value by a prescribed quantity or more. The reflection speed setting unit sets the reflection speed.