Ion-conducting membrane production method and production device

The purpose of the present invention is to provide a production method for producing an ion-conducting membrane with reduced impurities in a short time. A further purpose is to provide a more compaction-conducting membrane production device which can reduce the amount of treatment solution used. In order to achieve the purpose, the production method has the following configuration. The method, for producing an ion-conducting membrane that contains a polymer having an ionic group, involves multiple liquid treatment steps in which a precursor membrane is brought into contact with an acid treatment solution or an alkali treatment solution, the precursor membrane containing a polymer in a state in which the aforementioned ionic group forms a salt with an impurity ion, wherein the liquid treatment time in the second and subsequent liquid treatment steps of the multiple liquid treatment steps is shorter than the liquid treatment time in the initial liquid treatment step. 本发明的目的在于提供以短时间制造杂质减少了的离子传导膜的制造方法。并且，提供能够减少处理