A storage battery device according to an embodiment includes a battery group that includes a plurality of battery cells connected in series and a charge-and-discharge control FET unit that is connected to a low potential side of the battery group and includes at least a pair of N-channel MOSFETs the source terminals or the drain terminals of which are back-to-back connected. A drive controller outputs a drive control signal generated based on a potential level of the source terminals to a gate terminal of the respective N-channel MOSFETs included in the charge-and-discharge control FET unit.
