PROBLEM TO BE SOLVED: To provide conductive polymer fibers with superior conductivity, strength in dry and wet states, and flexibility, as well as a biological electrode provided therewith.SOLUTION: This invention relates to conductive polymer fibers 10 in which a conductor 12 containing a conductive polymer impregnates and/or adheres to base fibers 11, and the conductive polymer is PEDOT-PSS.【課題】導電性、乾燥状態及び湿潤状態における強度、並びに柔軟性に優れた導電性高分子繊維と、それを備えた生体電極を提供する。【解決手段】基材繊維11に、導電性高分子を含む導電体12が含浸及び/又は付着されてなり、前記導電性高分子がPEDOT-PSSであることを特徴とする導電性高分子繊維10。【選択図】図1