PROBLEM TO BE SOLVED: To provide a conductive polymer fiber having excellent conductivity, strength in dry and wet states, and flexibility, and a bioelectrode having the same.SOLUTION: A conductive polymer fiber 10 is formed by impregnating a base material fiber 11 with a conductor 12 comprising a conductive polymer and/or attaching the conductor 12 comprising a conductive polymer to the base material fiber 11, wherein 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