NOVELTY - The vehicle (1) has a floor panel (2) comprising an access port (8) communicating between an inner side and an outer side of a cabin (7). A battery pack (3) comprises a case (5) extending upward from an upper surface of another case (9) adjacent to the floor panel and a power shut-off mechanism. The latter case comprises an opening for allowing access to the power shut-off mechanism from outside the latter case. The opening is oriented in an access direction, where the power shut-off mechanism is accessed from the access port toward the opening.    USE - Electric vehicle (EV) e.g. hybrid electric vehicle (HEV) and fuel cell electric vehicle (FCEV).    ADVANTAGE - The vehicle comprises the case whose periphery is placed in an area partitioned by left side frame and right side frame of the vehicle and cross members while the battery pack is attached to the vehicle, thus preventing the case from being directly wetted and electric leakage. The vehicle comprises an access port provided on the floor panel and positioned above surrounding the floor panel, and a vertical wall horizontally extends around the access port, so that a space is formed by the surface having the access port and the vertical wall, thus protecting the power shut-off mechanism from being wet due to water splashing on the battery pack, and reducing occurrence of breakdown of the battery pack, and hence ensuring better working efficiency. The opening has an opening surface that is provided opposite to the access direction where the power shutoff mechanism is accessed, and the access port lies on the extension of the access direction, such that the access to the power shut-off mechanism from the inner side of the cabin of the vehicle can be easily facilitated. The battery pack is applicable to various vehicles having different body shapes by changing only the latter case, such that the battery pack can have broad utility.    DESCRIPTION OF DRAWING(S) - The drawing shows a side view of a vehicle showing a battery pack attached to lower side of floor of the vehicle.    Electric vehicle (1)    Floor panel (2)    Battery pack (3)    Cases (5, 9)    Cabin (7)    Access port (8)