NOVELTY - The device has a power generating element (10) whose terminal portion is provided on a main portion (10C), which includes an electrode formed by forming an active material layer on a metal foil surface of the electrode. A box-shaped outer package (20) accommodates the generating element. A current collector is connected to the terminal portion. A movement restricting element i.e. spacer (30), is made of synthetic resin, and has holding portions arranged between a side of the main portion and an inner surface of the outer package, where the inner surface faces opposite to the main portion side.    USE - Electrochemical device e.g. electric double layer capacitor such as lithium ion capacitor and battery such as large-size lithium ion battery, utilized in an electric vehicle and hybrid vehicle.    ADVANTAGE - The movement restricting element has the holding portions arranged between the main portion side and the inner surface of the outer package, so that deformation or sticking of the current collector into the power generating element can be avoided even when the electrochemical device is subjected to strong vibrations or high impact, thus providing high resistance to vibrations and impact of the device.    DETAILED DESCRIPTION - The terminal portion is selected from a positive terminal portion (10A) and a negative terminal portion (10B). The electrode is selected from a positive electrode and a negative electrode. The current collector is selected from a positive current collector (24A) and a negative current collector (24B).    DESCRIPTION OF DRAWING(S) - The drawing shows a front cross-sectional view of a cell illustrating an arrangement of an inside of an outer package.    Power generating element (10)    Positive terminal portion of power generating element (10A)    Negative terminal portion of power generating element (10B)    Main portion of power generating element (10C)    Outer package (20)    Positive current collector (24A)    Negative current collector (24B)    Spacer (30)