NOVELTY - The wound-type electric storage device (10) comprises an electrode sheet group that is formed by stacking of electrode sheets and accommodated in a casing (12) as wound. The electrode sheet group is composed of positive and negative electrodes. The first electrode sheet is provided at one of the outermost layers of the electrode sheet group, and includes a first electrode current collector and a first electrode mixture layer, which is applied onto one surface of the first electrode current collector. The second electrode sheet is provided at the outermost layer of the electrode sheet group.    USE - The wound-type electric storage device is useful as a lithium ion capacitor and a lithium ion secondary battery in an electric vehicle or an electric apparatus.    ADVANTAGE - The wound-type electric storage device has enhanced energy density, cell voltage, discharge capacity and capacitance.    DETAILED DESCRIPTION - The wound-type electric storage device (10) comprises an electrode sheet group that is formed by stacking of electrode sheets and accommodated in a casing (12) as wound. The electrode sheet group is composed of positive and negative electrodes. The first electrode sheet is provided at one of the outermost layers of the electrode sheet group, and includes a first electrode current collector and a first electrode mixture layer, which is applied onto one surface of the first electrode current collector. The second electrode sheet is provided at the outermost layer of the electrode sheet group, and includes a second electrode current collector and a second electrode mixture layer applied on one surface of the second electrode current collector. The third electrode sheet is provided between the first and second electrode sheets, and includes a third electrode current collector and a third electrode mixture layer applied on both surfaces of the third electrode current collector. The ions are supplied to first, second and third electrode mixture layers by an ion source sheet, which is overlapped on the electrode sheet group. The first and second electrode current collectors are formed with through-holes. The third electrode current collector is not formed with through-holes. The first and second electrode mixture layers are applied at the side of the third electrode sheet. The ion source sheet includes a lithium electrode current collector connected to one of the electrode current collectors, and metal lithium provided on both surfaces of the lithium electrode current collector. The first and second electrode sheets are configured to function as the positive electrode (20).    DESCRIPTION OF DRAWING(S) - The diagram shows a sectional view of a wound-type electric storage device.    Wound-type electric storage device (10)    Casing (12)    Separators (16)    Lithium electrode sheet (17)    Positive electrode. (20)