A storage battery management apparatus that switches a plurality of storage batteries used or a plurality of storage batteries connected in - series or in parallel as a connection mode of the plurality of storage batteries and that discharges or charges the storage batteries, the apparatus comprising: a chargeable electricity quantity management section adapted to calculate and manage, for each of the plurality of storage batteries, a quantity of chargeable electricity which is a quantity of electricity chargeable to be charged from a current charging state to a fully charged state; and a chargeable electricity quantity adjusting section (130, 131) adapted to control discharging or charging of the plurality of storage batteries so that part or whole of the quantities of chargeable electricity of the plurality of storage batteries reaches a common target quantity of electricity, characterized in that the storage battery management apparatus further comprises: a circuit control section adapted to make the plurality of storage batteries connected in parallel during discharging the storage batteries and to make the plurality of storage batteries connected in series during charging the storage batteries; and a chargeable electricity quantity adjusting section (130, 131) adapted to calculate, for each of the plurality of storage batteries, an integrated value of a current discharged from the storage battery while the plurality of storage batteries are connected in parallel, wherein the chargeable electricity quantity management section is further adapted to calculate the quantity of chargeable electricity based on the calculated integrated value of the current. a chargeable electricity quantity management section adapted to calculate and manage, for each of the plurality of storage batteries, a quantity of chargeable electricity which is a quantity of electricity chargeable to be charged from a current charging state to a fully charged state; and a chargeable electricity quantity adjusting section (130, 131) adapted to control discharging or charging of the plurality of storage batteries so that part or whole of the quantities of chargeable electricity of the plurality of storage batteries reaches a common target quantity of electricity, characterized in that the storage battery management apparatus further comprises: a circuit control section adapted to make the plurality of storage batteries connected in parallel during discharging the storage batteries and to make the plurality of storage batteries connected in series during charging the storage batteries; and a chargeable electricity quantity adjusting section (130, 131) adapted to calculate, for each of the plurality of storage batteries, an integrated value of a current discharged from the storage battery while the plurality of storage batteries are connected in parallel, wherein the chargeable electricity quantity management section is further adapted to calculate the quantity of chargeable electricity based on the calculated integrated value of the current. a circuit control section adapted to make the plurality of storage batteries connected in parallel during discharging the storage batteries and to make the plurality of storage batteries connected in series during charging the storage batteries; and a chargeable electricity quantity adjusting section (130, 131) adapted to calculate, for each of the plurality of storage batteries, an integrated value of a current discharged from the storage battery while the plurality of storage batteries are connected in parallel, wherein the chargeable electricity quantity management section is further adapted to calculate the quantity of chargeable electricity based on the calculated integrated value of the current.