A device for controlling current for charging/discharging a battery with a high accuracy includes a time-point setting unit which calculates a voltage difference by subtracting a calculated open-circuit voltage from a measured closed-circuit voltage, and sets first and second time points, at which an absolute value of the voltage difference becomes equal to or less than a predetermined value and an absolute value of a difference in the open-circuit voltage becomes equal to or less than a predetermined value. The control device further includes a current correction amount calculation unit to obtain the current integral amount, calculate the current error in a detection signal and set the current error as the current correction amount on the basis of the current integral amount and the time from the first time point to the second time point. The current correction unit corrects the detection signal using the current correction amount.