Abstract: Provided is an electrode material with excellent tab weldability and realizing decreased contact resistance with an active material layer. A collector (electrode material) (1) is provided with a metal foil substrate (1a) and a carbon-containing conductive substance (1b), and is configured such that, when observed from a square viewfield with a surface area of 0.1 mm2, the conductive substance (1b) is arranged in islands on the surface of the substrate (1a) with a 1-80% coverage ratio of the conductive substance (1b) on the surface of the substrate (1a).