NOVELTY - An electric double layer capacitor comprises a pair of polarizing electrodes (27) with a separator (7) in between, a pair of collectors (11) comprising metallic foil and electro-conductive polymer material layer (29), and a gasket (13) disposed at a periphery of the pair of polarizing electrode.    USE - The invention is used for, e.g. backup of memory units, energy regeneration in automobiles, and uninterruptible power supply in electronic devices.    ADVANTAGE - The invention avoids occurrence of dry-up from interfaces between collectors and terminal plates and from interfaces between adjacent electric double layer capacitors, without increase of production cost.    DETAILED DESCRIPTION - An electric double layer capacitor comprises:    (1) a pair of polarizing electrodes facing each other with a separator in between;    (2) a pair of collectors facing each other with the pair of polarizing electrodes in between; and    (3) a gasket disposed at a periphery of the pair of polarizing electrode, each of the collectors comprising a metallic foil and an electro-conductive polymer material layer formed on one surface of the metallic foil, each of the polarizing electrodes including a polymer material identical with the polymer material of the electro-conductive layer.    An INDEPENDENT CLAIM is also included for a method of manufacturing an electric double layer capacitor comprising:    (a) pressing and bonding a gasket on one surface of a metallic foil used as the collector with the metallic foil partially left uncovered with the gasket;    (b) obtaining first slurry by dispersing and dissolving first conductive polymer material into solvent;    (c) coating the first slurry onto a portion of the metallic foil uncovered with the gasket;    (d) drying the first slurry into a first conductive polymer layer;    (e) obtaining second slurry by dispersing and dissolving into solvent, activated carbon and second conductive polymer material identical with the first conductive polymer material;    (f) coating the second slurry on the first conductive polymer layer;    (g) drying the second slurry into the polarizing electrode to form a first lamina;    (h) preparing a second lamina identical in structure with the first lamina;    (i) facing the polarizing electrode of each of the first and the second laminas each other; and    (j) pressing and bonding each collector to the gasket to obtain a capacitor element.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the electric double layer capacitor.    Separator (7)    Collectors (11)    Gasket (13)    Polarizing electrodes (27)    Electro-conductive polymer material layer (29)