TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Material: The material for the pipe member can be ceramic.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: A salient portion is provided in an area, which is in contact with the terminal. An insulator is provided between the terminal and the pressure plate for insulation between the terminal and pressure plate, and includes an accommodating portion for accommodating the flange portion of the pipe member. A conductive member is provided between the cell stack and either one of the terminals. Projections are provided at a surface of the terminal(s), in which the surface is in contact with the cell stack. A sealing member is provided between the flange portion of the pipe member and the cell stack. The separators facing each other across the electrolyte membrane are bonded to each other using adhesive (21) at a gap provided near a peripheral portion of the flow path. Preferred Parameter: The gap formed between the flange portion of the pipe member and the cell stack is 0-3 mm. A height of the salient portion is 0-3 mm. A sum of a thickness of the terminal and a thickness of the insulator is greater than a thickness of the flange portion of the pipe member by a difference of 0-3 mm. The conductive member is 0-3 mm thick.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: A material for the conductive member is a metal or a carbon material.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Material: A material for the conductive member is a metal or a carbon material.    TECHNOLOGY FOCUS - POLYMERS - Preferred Material: The material for the conductive member can be conductive resin. A material for the sealing member is ethylene-propylene rubber, a fluorine-contained rubber, a silicone rubber, or a butyl rubber. A material for the pipe member is a polyphenylene oxide, a fluorine-contained polymer, a polypropylene, polyphenylene ether, a polyphenylene sulfide, a nylon, or preferably polyphenylene oxide.