The electrochemical device 40 includes a device main body 60 and an armoring body 50 for accommodating the device main body 60. The armoring body 50 is constituted by a laminated armoring material in which a heat-resistant resin layer 2 is adhered to a first surface of a metal foil layer 4 and a thermal fusion resin layer 3 is adhered to a second surface of the metal foil layer 4, and metal exposed sections 54 and 56 in which the metal foil layer 4 is exposed is formed at least on the heat-resistant resin layer 2 side which is an outer side of the laminated armoring material 50.