TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The anode includes an exposed anode region (22D) in an outer end portion (22B1) of the anode, the exposed anode region in which the anode current collector is not covered with the anode active material layer and is exposed, and to which an anode lead is connected, and the exposed anode region extends to a position opposed to a position where the anode lead is connected in one turn inside the position. The cathode includes an outer cathode active material layer on an outer surface of the cathode current collector and an inner cathode active material layer on an inner surface of the cathode current collector. A cathode lead (25) is connected to near a central end portion of the cathode current collector, and the cathode lead is disposed to avoid a region from a central angle of 30degrees from the central end portion of the inner cathode active material layer in a winding direction R to a central angle of 30degrees from the central end portion of the inner cathode active material layer in a direction opposite to the winding direction at the center of the spirally wound body. A central angle between a central end portion of the outer cathode active material layer and a central end portion of the inner cathode active material layer at the center of the spirally wound body is greater than or equal to72degrees. Preferred Property: The protective member is formed to have a width of 0.5-5 mm larger than the width of the cathode current collector. In the cathode active material layer, a central angle between an outer end portion and a central end portion at a center of the spirally wound body ranges from 0degrees to -90degrees inclusive from the central end portion in a winding direction.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: As the anode active material, the anode includes a material including at least one of tin and silicon. The anode contains a cobalt tin carbon-containing material in which tin, cobalt and carbon are included, and a carbon content of 9.9-29.7 weight %, and a ratio of cobalt to a total of tin and cobalt of 30-70 weight %.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The protective member is made of any one of polypropylene and polyethylene terephthalate.