NOVELTY - The device has connection portion (4P) that is connected with corner of end plate (3). L-shape cross-section is formed by connection portion by connecting horizontal portion (4X) and perpendicular portion (4Y) at right angle. An end surface plate (4T) which covered outer surface of end plate is connected with edge of horizontal and perpendicular portions. The end plate is provided with latching convex portion (5) in corner of end surface plate. A bind bar (4) is provided with locking hole (6) via which latching convex portion is latched on end surface plate.    USE - Power supply device for use in electric vehicle and electrical storage apparatus (all claimed) for household and factory. Can also be used in hybrid vehicle, fuel cell electric vehicle, electric vehicle, electrically-driven motorcycle and plug-in hybrid motor vehicle.    ADVANTAGE - Since the bind bar can be fixed to the end plate easily, by making the locking hole to latch the latching convex portion on the end surface plate, the use of the screwing and riveting processes in the power supply device can be eliminated. Hence the fixed operation of the bind bar can be simplified, and the cost of the device can be reduced, and the external shape of the device can be made small and compact. Since the device can prevent the four-direction relative displacement of the square battery with the bind bar, the vibration-resistant intensity of the device can be improved. Since the space of the pair of end plate can be maintained uniformly, the fall of the electrical property of the device by time-dependent expansion of the square battery can be prevent effectively.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) an electric vehicle; and    (2) an electrical storage apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the power supply device.    End plate (3)    Bind bar (4)    Connection portion (4P)    End surface plate (4T)    Horizontal portion (4X)    Perpendicular portion (4Y)    Latching convex portion (5)    Locking hole (6)