The present invention provides an electric storage device, capable of ensuring durability and improving energy density as well as output density. A negative electrode (15) arranged at the center of an electrode laminate unit (12) 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 positive-electrode mixture layer (20) containing a lithium cobalt oxide having a high capacitance characteristic is provided to the positive electrode (13), and a positive-electrode mixture layer (22) containing an activated carbon having a high output characteristic is provided to the other positive electrode (14). Since these positive electrodes (13) and (14) are provided, an energy density and an output density can be enhanced. Ions can be transferred 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 electrode (13, 14) after the high-rate discharging can be cancelled. Therefore, durability of the electric storage device (10) can be secured.