An electrode for a secondary battery includes a current collector, and an active material layer being formed on a surface of the current collector, and containing an active material and a binder, in which the active material contains SiOx, a surface of SiOx is modified with one or more groups selected from the group consisting of an aniline group, an imidazole group, and an amino group, and the binder is constituted by a water-soluble polymer having a sugar chain structure that contains a carboxylic acid group.