The present invention provides a bio-electrode composition capable of forming a living body contact layer for a bio-electrode that is excellent in conductivity and biocompatibility, is light-weight, can be manufactured at low cost, and can control significant reduction in conductivity even though the bio-electrode is soaked in water or dried. The present invention is accomplished by a bio-electrode composition including an (A) ionic material and a (B) resin other than the component (A), in which the component (A) has both a repeating unit “a” of a sodium salt, a potassium salt, or an ammonium salt including a partial structure represented by the following general formula (1) and a repeating unit “b” having a silicon atom. -R1-SO2-N--SO2-Rf1M＋(1)本發明提供一種生物體電極組成物，能形成導電性及生物體適合性優異、輕量、且能以低成本製造，即使被水潤濕了，導電性亦不會大幅下降的生物體電極用之生物體接觸層。一種生物體電極組成物，含有(A)離子性材料、及(B)前述(A)成分以外之樹脂，前述(A)成分具有：具下列通式(1)表示之次結構之鈉鹽、鉀鹽、銨鹽之重複單元a，以及具有矽之重複單元b兩者。 -R1-SO2-N--SO2-Rf1M＋(1)
