FUEL INJECTION CONTROL DEVICE

A fuel injection control device has a conduction time calculation unit (S12), a setting unit (S14, S15), a conduction control unit (S16), a detection unit (54), an estimation unit (55), and a changing unit (S47). The conduction time calculation unit calculates a conduction time of an electric actuator corresponding to a requested injection quantity during partial lift injection. The setting unit sets the conduction time as a command conduction time when a conduction time calculated by the conduction time calculation unit is equal to or higher than a lower limit time and sets the lower limit time as a command conduction time when a conduction time is smaller than the lower limit time. The conduction control unit energizes an electric actuator on the basis of a command conduction time set by the setting unit. The detection unit detects a physical quantity having a correlation with an actual injection quantity during partial lift injection. The estimation unit estimates an actual injection quantity on the basis of a detection result of the detection unit. The changing unit changes a lower limit time on the basis of a deviation between an estimated actual injection quantity and a requested injection quantity.