Method of producing membrane electrode assembly

The invention relates to a mehtod of producing a membrane electrode assembly. The method of producing the membrane electrode assembly including an electrolyte film, includes: a process of obtaining amembrane body by forming an electrolyte resin precursor which is a precursor of an electrolyte resin used in the electrolyte film into a film form; and a hydrolysis process of obtaining the electrolyte film by hydrolyzing the membrane body, wherein the hydrolysis process includes a process of passing the membrane body through a first tank in which an alkaline aqueous solution is accommodated and aprocess of passing the membrane body through second tanks in which an aqueous solution in which a water-soluble hydroxy radical elimination accelerator is dissolved in advance is accommodated after the membrane body is passed through the first tank. 本发明涉及制造膜电极组件的方法。制造包括电解质膜的膜电极组件的方法，包括：通过将作为在电解质膜中使用的电解质树脂的前体的电解质树脂前体形成为膜状来获得膜体的过程；以及通过对膜体进行水解来获得电解质膜的水解过程，其中，水解过程包括以下过程：使膜体穿过容纳碱性水溶液的第槽，并且在膜体穿过第槽之后使膜体穿过第二槽，在第二槽中容纳了其中预先溶解有水溶性羟自