A power storage apparatus, comprising: a battery section in which a plurality of power storage element sections(Ce1-Ce3) each including at least one power storage element are connected in series; a cell-balancing circuit (CB, SW1-SW3) that is connected in parallel to the plurality of power storage element sections (Ce1-Ce3), and wherein the cell-balancing circuit (CB, SW1-SW3) is for performing a cell-balancing operation between the plurality of power storage element sections(Ce1-Ce3); a control unit for controlling a cell-balancing current flowing through the cell-balancing circuit; and entire-current measurement means for measuring a current value of an entire current flowing through the entire battery section, and cell-balancing current measurement means for measuring a current value of the cell-balancing current, wherein the control unit is further configured for, in the cell-balancing operation, controlling the cell-balancing circuit (CB, SW1-SW3) in a time division manner such that the cell-balancing current measurement section measures a current (Ibl) flowing into each of the power storage element sections (Ce1, Ce3) of the battery section, the entire-current measurement means and the cell-balancing current measurement means are formed by a common single current measurement section (AMab), a module terminal (P, M) is electrically connected to the battery section, and the module terminal (P, M) is connectable to a charging circuit for charging, and the module terminal (P, M) is further connectable to a load for discharging, and the common current measurement section (AMab) is connected between the module terminal (P, M) and the battery section. a battery section in which a plurality of power storage element sections(Ce1-Ce3) each including at least one power storage element are connected in series; a cell-balancing circuit (CB, SW1-SW3) that is connected in parallel to the plurality of power storage element sections (Ce1-Ce3), and wherein the cell-balancing circuit (CB, SW1-SW3) is for performing a cell-balancing operation between the plurality of power storage element sections(Ce1-Ce3); a control unit for controlling a cell-balancing current flowing through the cell-balancing circuit; and entire-current measurement means for measuring a current value of an entire current flowing through the entire battery section, and cell-balancing current measurement means for measuring a current value of the cell-balancing current, wherein the control unit is further configured for, in the cell-balancing operation, controlling the cell-balancing circuit (CB, SW1-SW3) in a time division manner such that the cell-balancing current measurement section measures a current (Ibl) flowing into each of the power storage element sections (Ce1, Ce3) of the battery section, the entire-current measurement means and the cell-balancing current measurement means are formed by a common single current measurement section (AMab), a module terminal (P, M) is electrically connected to the battery section, and the module terminal (P, M) is connectable to a charging circuit for charging, and the module terminal (P, M) is further connectable to a load for discharging, and the common current measurement section (AMab) is connected between the module terminal (P, M) and the battery section.