Electrode structure, biosignal measurement device, and composition for adhesive agent formation use

The purpose of the present invention is to provide: an electrode structure which is free of the problem of dryness caused by the volatilization of water or an organic solvent and is provided with an adhesive agent layer having sufficient electrical conductivity and excellent adhesiveness; a biosignal measurement device equipped with the electrode structure; and a composition for adhesive layer formation use, which can be used suitably as an adhesive agent layer in the electrode structure. An electrode structure provided with: an electrically conductive adhesive agent layer; a support for supporting the adhesive agent layer; and a wiring line or a terminal which is connected to the adhesive agent layer. In the electrode structure, the content of water and an organic solvent in the adhesive agent layer is 10% by mass or less and the volume resistivity of the adhesive agent layer is 1500 Ωcm or less.