PROBLEM TO BE SOLVED: To provide an electrolytic cell with which early corrosion of an electrode plate is drastically suppressed or prevented by rapidly introducing gaseous chlorine or the like, tending to build up on the upper side of each electrolytic chamber of a diaphragm electrolytic cell, to an outlet of water produced by electrolysis, discharging it to the outside of the system, making the water produced by electrolysis smoothly flow out from the outlet, and suppressing or certainly controlling exposure of an upper end portion of the electrode plate to the gaseous chlorine.;SOLUTION: The electrolytic cell is constructed by forming a plurality of gaps E arranged in parallel to one another in the direction of the width of the electrolytic chamber between members facing stepped parts 13a, 13b and members opposite thereto, wherein the stepped parts 13a, 13b having recessed shapes and opening on the side opposite to a membrane 10c are arranged on the upper end portion of each vertical frame portion 13 of spacers 10a, 10b constructing an electrode plate unit 10, so as to capture a gas produced on surfaces of the electrode plates 10d, 10e in the respective gaps E, and to make the captured gas flow out together with the water produced by electrolysis.;COPYRIGHT: (C)2011,JPO&INPIT
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