Abstract: The invention relates to a binder for an electrode material of an electrochemical device, said binder comprising an aqueous dispersion (I) containing a water-dispersible resin; (I) containing at least one of a thermoreversible thickening vinylic polymer (A) having reversibility of hydrophilicity and hydrophobicity at a certain transition temperature (T) and a water-dispersible resin (B) having a fluorine atom-containing unit; an electrode material dispersion for an electrochemical device, which comprises the said binder and an electrode material (E); an electrode for an electrochemical device, formed from said electrode material dispersion; and a primary cell, a secondary cell, an aluminum electrolytic capacitor or an electric double layer capacitor, which has said electrode.