ELECTROLYSIS APPARATUS

The present invention comprises: an outer cylinder (2) provided with an introduction port (3) and a discharge port (4) on a side surface (2a) of a cylinder; a plurality of positive electrode plates connected to a first base at an equal interval, and disposed in the vicinity of one of the introduction port (3) and the discharge port (4); a plurality of negative electrode plates connected to a second base at an equal interval, and disposed in the vicinity of the other of the introduction port (3) and the discharge port (4); and a plurality of positive electrode-side spacers (20) having electric insulation properties and disposed in every space between the plurality of positive electrode plates, or a plurality of negative electrode-side spacers (30) having electric insulation properties and disposed in every space between the plurality of negative electrode plates. One of the ports is located on the radially outer side from the space formed between the plurality of positive electrode plates or between the negati