<p>An electrode construct for iontophoresis which makes it possible to hold a drug in a stable state over a long time and transdermally administer it at a high delivery efficiency in using. More specifically speaking, an electrode construct for iontophoresis aiming at transdermally administering an ionic drug to a living body via iontophoresis which is characterized in that use is made of at least a constituting material showing electrical conductivity when an aqueous vehicle is supplied thereto, this constituting material holds the ionic drug in a dry state and, when the aqueous medium is supplied to the constituting material in using, the ionic drug is dissolved in the aqueous vehicle.</p>
