NOVELTY - The device i.e. electric double layer capacitor (100), has a collector (C) including electrodes (110a, 110b) e.g. activated carbon electrodes, that are placed opposite to each other. The collector includes an ion transmittable separator (130) placed between the electrodes. A fixing member (140) surrounds an external surface of the collector and fixes the collector by bending parts formed at ends of the collector. The fixing member is made of metallic material and a wire having a circular cross section, where the metallic material is coated with an insulating layer.    USE - Electrochemical device i.e. electric double layer capacitor, for use as an energy storage apparatus for supplying energy to an electronic product e.g. information communication and technology equipment such as cellular phone, an electric vehicle and a solar cell. Can also be used for a pseudo capacitor, a hybrid capacitor and a lithium ion capacitor.    ADVANTAGE - The fixing member maximizes an overlapping portion between the electrodes and minimizes movements of the ion transmittable separator and the electrodes during a stacking process of the electrodes and the ion transmittable separator and a package process, thus increasing energy density and capacity of the device. The fixing member can be made of material having appropriate strength and easily shaped by pressurization, so that changed shape can be maintained for long period of time. The insulating layer can be formed on the metallic material to prevent an electrical short-circuit. The fixing member occupies small area in the collector, thus reducing an area in which infiltration of an electrolyte is interrupted. The device prevents a terminal drawing part from being torn or a fusion malfunction from being generated during a connection process, thus solving a problem that resistance is increased. The fixing member occupies a small area in the terminal drawing part, thus facilitating connection with an external terminal.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for manufacturing an electrochemical device.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of an electric double layer capacitor.    Collector (C)    Electric double layer capacitor (100)    Electrodes (110a, 110b)    Ion transmittable separator (130)    Fixing member (140)