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 after the high-rate discharging can be canceled. Therefore, durability of the electric storage device can be secured.