NOVELTY - The cell has a container (10) in which an opening of a concave portion (11) is sealed. An electrolytic solution (40) and a pair of electrode active materials (30a,30b) are accommodated inside the container. A pair of conductive films (20a,20b) is respectively and electrically connected to the pair of electrode active materials. The conductive films are formed from a valve metal and formed from the bottom surface of the concave portion to a surface of the container through an opening edge (19).    USE - Electrochemical cell e.g. electric double layer capacitor and non-aqueous electrolyte battery used as power source of electric automobile and auxiliary electric storage unit of energy conversion/storage system.    ADVANTAGE - The sealing property of the container is ensured, by simply connecting the current electrode to the external electrode at a low cost without using a lead frame or via, by forming conductive films from the bottom surface of the opening edge. The manufacturing cost is decreased, since it is not necessary to form the conductive film using a material that endures a sintering temperature of the container. The same amount of electrolytic solution is impregnated into the pair of electrode active materials and hence a difference in electrolytic characteristics caused by a difference in impregnation amount is prevented. An internal resistance of the electric double layer capacitor is reduced, by placing the pair of active electrode materials adjacent to each other by decreasing the width of the protrusion as small as possible. The sealing property of the container is improved, by providing sealing material together with the opening seal plate to seal the container. Hence even when the container is used for a long time, the entry of moisture from the bonding portion and a leakage of a liquid from the container are prevented. Hence a long term reliability of the electric double layer capacitor is improved.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method of manufacturing electrochemical cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a side sectional view of an electric double layer capacitor.    Container (10)    Concave portion (11)    Opening edge (19)    Conductive films (20a,20b)    Electrode active materials (30a,30b)    Electrolytic solution (40)