An apparatus for driving an injector injecting fuel into an internal combustion engine, the injector being provided with a piezoelectric element to be charged and discharged, the apparatus comprising: a driver unit provided with a charging means adapted to be driven to charge the piezoelectric element and a power source means adapted to supply electric power to the charging means; a temperature obtaining means (62-65; 40, S110, S120) adapted to obtain a temperature of the driver unit; an acquiring means (74, 60-65, 40: S110, S120) adapted to acquire operation information indicating either an operation of the piezoelectric element or an electric characteristic of the apparatus, the operation information including information indicating the temperature of the driver unit; a calculating means (40: S130-S160) adapted to calculate a command value on which the charging means charges the piezoelectric element, wherein the calculating means includes a correcting means (40: S130-S150) adapted to correct, under an open-loop control, the command value based on the operation information acquired by the acquiring means so as to cancel changes in electric energy to be charged at the piezoelectric element, the changes being fluctuations from a desired amount of electric energy corresponding to the command value; and a control means adapted to control drive of the charging means in response to the corrected command value such that the charging means uses the supplied electric power to charge the piezoelectric element at the desired amount of the electric energy, wherein the acquiring means is adapted to acquire, as the operation information, information indicating at least one of a capacitance of the piezoelectric element and a voltage applied to the piezoelectric element; and the correcting means is adapted to increase the command value so as to cancel, as the changes in the electric energy to be charged at the piezoelectric element, an influence of successive fuel injection carried out by the injector. a driver unit provided with a charging means adapted to be driven to charge the piezoelectric element and a power source means adapted to supply electric power to the charging means; a temperature obtaining means (62-65; 40, S110, S120) adapted to obtain a temperature of the driver unit; an acquiring means (74, 60-65, 40: S110, S120) adapted to acquire operation information indicating either an operation of the piezoelectric element or an electric characteristic of the apparatus, the operation information including information indicating the temperature of the driver unit; a calculating means (40: S130-S160) adapted to calculate a command value on which the charging means charges the piezoelectric element, wherein the calculating means includes a correcting means (40: S130-S150) adapted to correct, under an open-loop control, the command value based on the operation information acquired by the acquiring means so as to cancel changes in electric energy to be charged at the piezoelectric element, the changes being fluctuations from a desired amount of electric energy corresponding to the command value; and a control means adapted to control drive of the charging means in response to the corrected command value such that the charging means uses the supplied electric power to charge the piezoelectric element at the desired amount of the electric energy, wherein the acquiring means is adapted to acquire, as the operation information, information indicating at least one of a capacitance of the piezoelectric element and a voltage applied to the piezoelectric element; and the correcting means is adapted to increase the command value so as to cancel, as the changes in the electric energy to be charged at the piezoelectric element, an influence of successive fuel injection carried out by the injector.