A control unit for driving a fuel injection device by supplying a current to the fuel injection device, the fuel injection device comprising: a valve body that contacts with a valve seat to close a fuel passage, and moves away from the valve seat to open the fuel passage; a needle that executes valve opening/closing operation in cooperation with the valve body; an electromagnet that includes a coil and a magnetic core provided as a driver for driving the needle, and a cylindrical nozzle holder disposed on an outer periphery of the magnetic core and the needle; and an urging unit that urges the valve body in a direction opposite to a direction of a driving force by the control unit, in which a current is supplied to the coil to exert a magnetic attractive force between the magnetic core and the needle to open the valve body, wherein a sum of a hydrodynamic force exerted on the valve body and the load caused by the urging unit in a valve closing direction increases up to a given amount of lift of the valve body as an amount of lift of the valve body increases; the control unit characterized by a driver circuit configured to start a valve closing operation of the valve body of the fuel injection device at an intermediate position between a valve closing position where the valve body contacts with a valve seat and a maximum amount of lift of the valve body, and the driver circuit further configured to start closing the valve body in a range of positive correlation where the sum of the hydrodynamic force exerted on the valve body and load caused by the urging unit of the fuel injection device in a valve closing direction increases according to an increase of the amount of lift of the valve body, wherein, in the range of positive correlation, the fuel injector is controlled to exert a given size of magnetic attractive force, which is not higher than the sum of the hydrodynamic force and the load caused by the urging unit at a predefined amount of lift of the valve body. a valve body that contacts with a valve seat to close a fuel passage, and moves away from the valve seat to open the fuel passage; a needle that executes valve opening/closing operation in cooperation with the valve body; an electromagnet that includes a coil and a magnetic core provided as a driver for driving the needle, and a cylindrical nozzle holder disposed on an outer periphery of the magnetic core and the needle; and an urging unit that urges the valve body in a direction opposite to a direction of a driving force by the control unit, in which a current is supplied to the coil to exert a magnetic attractive force between the magnetic core and the needle to open the valve body, wherein a sum of a hydrodynamic force exerted on the valve body and the load caused by the urging unit in a valve closing direction increases up to a given amount of lift of the valve body as an amount of lift of the valve body increases; the control unit characterized by a driver circuit configured to start a valve closing operation of the valve body of the fuel injection device at an intermediate position between a valve closing position where the valve body contacts with a valve seat and a maximum amount of lift of the valve body, and the driver circuit further configured to start closing the valve body in a range of positive correlation where the sum of the hydrodynamic force exerted on the valve body and load caused by the urging unit of the fuel injection device in a valve closing direction increases according to an increase of the amount of lift of the valve body, wherein, in the range of positive correlation, the fuel injector is controlled to exert a given size of magnetic attractive force, which is not higher than the sum of the hydrodynamic force and the load caused by the urging unit at a predefined amount of lift of the valve body.