A negative electrode (15) includes a negative-electrode current collector (16) provided with a large number of through-holes (16a) and a negative-electrode mixture layer (17) applied thereon. Positive electrodes (13) and (14) are arranged so as to sandwich the negative electrode (15). A thin positive-electrode mixture layer (20) having a high output characteristic is provided to the positive electrode (13), and a thick positive-electrode mixture layer (22) having a high capacity is provided to the other positive electrode (14). Since these positive electrodes (13) and (14) having different charging/discharging characteristics are provided, the energy density and the output density can be enhanced. Ions can move between the positive-electrode mixture layers (20) and (22) via the through-holes (16a) of the negative-electrode current collector (16), whereby a variation in the potential of the positive electrodes (13) and (14) can be canceled. Therefore, the durability of the electric storage device (10) can be ensured.