To secure high durability of an injector by enabling avoidance of generation of excessive electromagnetic attraction force without deteriorating controllability of the injector in injector control of a fuel injection system.

The injector control device 10A opening the injector 21A by electromagnetic attraction force of a solenoid 21 and performing opening/closing control by switching ON/OFF of fuel injection signal, is provided with a valve opening retard time calculation means having a valve opening detection signal input therein from a vibration detector 2 which is a valve opening detection means detecting valve opening completion of the injector 20A and calculating a valve opening retard time from the output of fuel injection signal to the detection of the valve opening detection signal, and adjusting means for adjustment of valve opening retard time to a target valve opening retard time, and executes control in a direction to keep the minimum necessary voltage apply time for materializing the target valve opening retard time while securing positive valve opening operation.