To provide: a biological electrode composition that can form a living body contact layer for a biological electrode which is excellent in conductivity and biocompatibility, as well as light in weight and producible at a low cost, and in addition, which does not cause a significant decrease in the conductivity regardless of under a water-wet condition and a dry condition； a polymer compound which can be suitably used for the biological electrode composition； a polymerizable monomer suitable as a raw material of the polymer compound； a biological electrode having a living body contact layer formed of the biological electrode composition； and a method for producing the same.SOLUTION: The present invention relates to a polymerizable monomer represented by following general formula (1).SELECTED DRAWING: Figure 1【課題】導電性及び生体適合性に優れ、軽量であり、かつ低コストで製造することができ、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用の生体接触層を形成できる生体電極組成物、該生体電極組成物に好適に用いられる高分子化合物、該高分子化合物の原料として好適な重合性モノマー、上記の生体電極組成物で生体接触層を形成した生体電極、及びその製造方法を提供する。【解決手段】下記一般式（１）で示される重合性モノマー。 【化１】【選択図】図１
