NOVELTY - A fuel cell stack that is provided with a set of stacked separators, comprises: terminals that extend from an optional one of the separators; packing that has a set of through holes through which the terminals are inserted; a packing casing that has a packing housing concave portion that envelops the packing and supports a bottom surface of the packing; and a connector member comprising a pressing surface that presses a top surface and side surfaces of the respective circumferential wall portions of the packing.    USE - The fuel cell stack is useful for fuel cell vehicle and for industrial application.    ADVANTAGE - The fuel cell stack enables a terminal group made up of a set of terminals to be waterproofed all together without a waterproofing member needing to be provided individually for each terminal, and that has a waterproofing mechanism with excellent sealing properties.    DETAILED DESCRIPTION - A fuel cell stack that is provided with a set of stacked separators, comprises: terminals that extend from an optional one of the separators; packing that has a set of through holes through which the terminals are inserted, and that has an independent circumferential wall portion for each through hole; a packing casing that has a packing housing concave portion that envelops the packing and supports a bottom surface of the packing, and has through holes through which the terminals are inserted; and a connector member comprising a pressing surface that presses a top surface and side surfaces of the respective circumferential wall portions of the packing, where bulge portions are provided on at least one of the side surfaces of the circumferential wall portions and the pressing surfaces that press the side surfaces, where each bulge portion protrudes to press against the other of the side surfaces of the circumferential wall portions and the pressing surface, and internal surfaces of the through holes in the packing are in contact without a gap with external surfaces of the terminals.