To provide an electrode composition for a living body contact layer of a bioelectrode, the living body contact layer being characterized in excellent electric conductivity and biocompatibility, and reduced weight and cost, and being free from substantial degradation of the electric conductivity even if wetted with water or dried.SOLUTION: Provided is a bioelectrode composition comprising a silsesquioxane bonded to an N-carbonyl sulfonamide salt, the bioelectrode composition being characterized in that the N-carbonyl sulfonamide salt is represented by the following general formula (1). (In the formula, Ris a linear, branched, or cyclic alkylene group with 1 to 20 carbon atoms; Rf is a linear, branched, or cyclic alkyl group with 1 to 4 carbon atoms; and Mis an ion selected from a lithium ion, a sodium ion, a potassium ion, and a silver ion.)SELECTED DRAWING: Figure 1【課題】導電性及び生体適合性に優れ、軽量、かつ低コストで、水に濡れても乾燥しても導電性が大幅に低下することがない生体電極の生体接触層用の電極組成物を提供する。【解決手段】N-カルボニルスルホンアミド塩に結合するシルセスキオキサンを含有する生体電極組成物であって、前記N-カルボニルスルホンアミド塩が下記一般式(1)で示されるものであることを特徴とする生体電極組成物。(式中、R1は炭素数1~20の直鎖状、分岐状、環状のアルキレン基、Rfは炭素数1~4の直鎖状、分岐状、環状のアルキル基、M+はリチウムイオン、ナトリウムイオン、カリウムイオン、銀イオンから選択されるイオン。)【選択図】図1