NOVELTY - The case (11) has an electrical storage apparatus provided with a positioning part i.e. recessed part (30), for matching position of a jig. A sealing stopper (20) is inserted in an injection hole (14c) for pouring electrolyte solution into an inner side of the electrical storage apparatus. A cover body (14) obstructs an opening part (13a) of a bottomed cylindrical case main body (13). The positioning part and the injection hole are located in the cover body. An electrode terminal is electrically connected with an electrode assembly protruded from the cover body.    USE - Case for accommodating battery elements i.e. electrode assembly, in an electrical storage apparatus e.g. power supply device such as lithium ion secondary battery, utilized in a vehicle e.g. motor vehicle, electric vehicle (EV) and plug-in-type hybrid vehicle (PHV). Can also be used in an industrial vehicle.    ADVANTAGE - The case allows the sealing stopper to be inserted in the injection hole for pouring the electrolyte solution into the inner side of the electrical storage apparatus, so that position alignment with the injection hole and the sealing stopper can be precisely performed at the time of sealing of the injection hole with the sealing stopper, thus suppressing deformation of the case when the positive electrode terminal and the negative electrode terminal are not active.    DETAILED DESCRIPTION - The electrical storage apparatus is a lithium ion secondary battery (10). The injection hole is a circular-shaped hole. The electrode terminal is a positive electrode terminal (15) and a negative electrode terminal (16). An INDEPENDENT CLAIM is also included for a method for sealing a case.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a case.    Lithium ion secondary battery (10)    Case (11)    Bottomed cylindrical case main body (13)    Opening part (13a)    Cover body (14)    Injection hole (14c)    Positive electrode terminal (15)    Negative electrode terminal (16)    Sealing stopper (20)    Recessed part (30)