Electrode member and device

Provided are an electrode member and a device capable of maintaining high electrical conductivity even after repeated washing, and of also being applied as an electrode for an organism. This electrode member is characterized by being a fiber structure configured from a textile or the like including an electroconductive polymer, wherein an electroconductive polymer such as a polythiophene-based electroconductive polymer is supported on the surfaces of single fibers and/or in spaces between single fibers constituting a multifilament used in the fiber structure.