NOVELTY - The battery has an internal negative electrode terminal (17) connected to a plate-like conductive unit (47a) through through-holes that are formed in a sealing plate (20) and first and second insulating units (19b) e.g. gaskets (19a). A protrusion (40) is formed on a face of the sealing plate. A concave portion (49a) is formed on a face of the first insulating unit closer to the sealing plate. The protrusion and the concave portion of the first insulating unit are provided at a position on sides of one of the through-holes. Another concave portion (49c) is formed on top face of the protrusion.    USE - Prismatic secondary battery i.e. prismatic non-aqueous electrolyte secondary battery, for use as power supplies for driving a portable electronic equipment e.g. cell phones such as smartphones, portable computers, PDAs and portable music players, electric vehicles and hybrid electric vehicles. Can also be used as a nickel-hydrogen secondary battery.    ADVANTAGE - The battery increases binding strength of the sealing plate, the first insulating unit, the second insulating unit and the collector such that rotary torque applied to the conductive unit is unlikely to be applied to the collector, thus improving reliability of the battery. The concave portion expands the top area of the protrusion along a diameter expanding direction to reduce radius of an R shape so as to increase a contact area between a lateral face of the protrusion of the sealing plate and an inner face of the first insulating unit such that the battery obtains a large load-bearing capacity of a fitting portion between the protrusion of the sealing plate and the concave portion of the first insulating unit and avoids rotational displacement between the sealing plate and the first insulating unit due to the rotary torque caused at a time of bolting of a bus bar to the bolt formed on the conductive unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal sectional view of a prismatic secondary battery.    Internal negative electrode terminal (17)    Gaskets (19a)    Insulating units (19b)    Sealing plate (20)    Protrusions (40, 41)    Concave portions (40a, 40c, 49a, 49c)    Plate-like conductive unit (47a)