A capacitor (2) has an exterior package case (12) housing an electrolyte (4) along with a capacitor element (10), a sealing plate (14) where an external terminal is disposed , the sealing plate sealing the exterior package case, and a current collecting plate (18-1, 18-2) disposed between an electrode protruding portion formed on an element end surface of the capacitor element and the external terminal, and comprises a gas releasing mechanism (a safety valve 16) disposed in the sealing plate to release a gas in the exterior package case, and a blocking mechanism (6) disposed on at least one of the sealing plate and the current collecting plate to block the electrolyte from the gas releasing mechanism. As a result, the electrolyte is blocked by the blocking mechanism and therefore does not deteriorate the releasing function of the gas releasing mechanism.