NOVELTY - The terminal cover (70) has a base wall (71) of shape provided integrally with an insulation cover (19) and that encloses perimeter of a positive electrode terminal (41), and a movable wall (75) of shape that surrounds the perimeter of positive electrode terminal. The movable wall is movable to a direction that adjoins to direction in which tip of positive electrode terminal is spaced apart from a case (12) with respect to the base wall in state exposed outside and immersed inside the case. A compression helical spring (8) biases movable wall in direction spaced apart from case.    USE - Terminal cover for electrical storage apparatus e.g. secondary battery such as square-shaped lithium ion battery used in e.g. electric vehicle (EV), plug-in hybrid vehicle (PHV).    ADVANTAGE - Suppresses short circuit of the electrode terminal with terminal cover since tip of electrode terminal is in the state immersed in the inside of movable wall when bus-bar is not connected to the electrode terminal. The terminal cover does not remove unnecessarily from the secondary battery and is not troubled by the temporary storage place or storage area of terminal cover since tip of electrode terminal is in the state exposed to exterior of movable wall when connecting the bus-bar to electrode terminal and bus-bar is connected to electrode terminal without the terminal cover being blocked by the same terminal cover in the state provided in secondary battery. The terminal cover is easily attached to the secondary cover by attaching the terminal cover to lid with the insulation cover since terminal cover is integrally provided in the insulation cover. Obtains cost reduction and ensures easy attachment of the terminal cover to secondary battery since number of components is decreased and assembly man-hour is reduced by integrally forming the terminal cover with insulation cover. The movable wall is moved so that terminal cover is shortened when connecting the bus-bar to electrode terminal. Eliminates need for operation that protects the electrode terminal in case of removal of bus-bar and ensures protection of the electrode terminal with the terminal cover.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the terminal cover.    Compression helical spring (8)    Case (12)    Insulation cover (19)    Positive electrode terminal (41)    Terminal cover (70)    Base wall (71)    Movable wall (75)