PROBLEM TO BE SOLVED: To provide an electrode structure capable of maintaining a state in which an electrode is stably brought into contact with a concave surface of a living body, and a biosensor device. An electrode structure is electrically connected to a surface layer, a bottom layer having through holes, a conductive polymer sheet provided between the surface layer and the bottom layer, and an end portion of the conductive polymer sheet. The conductive member is provided between the surface layer and the conductive polymer sheet, and includes an elastic member that projects a part of the conductive polymer sheet through a through hole in the bottom layer. [Selection diagram] Fig. 2【課題】生体の凹面に電極を安定的に接触させた状態を保持できる電極構造、及び、生体センサデバイスを提供する。【解決手段】電極構造は、表面層と、貫通孔を有する底面層と、前記表面層と前記底面層との間に設けられる導電ポリマーシートと、前記導電ポリマーシートの端部に電気的に接続される導電部材と、前記表面層と前記導電ポリマーシートとの間に設けられ、前記導電ポリマーシートの一部を前記底面層の貫通孔を通じて突出させる弾性部材とを含む。【選択図】図２
