A medical electrode comprising (i) an adhesive hydrogel comprising a polymer matrix prepared by crosslinking-copolymerization of an acrylamide derivative, which is a nonionic polymerizable monomer comprising a polymerizable carbon-carbon double bond in a molecule, and polyfunctional (meth)acrylamide, which is a crosslinkable monomer comprising 2 or more polymerizable carbon-carbon double bonds in a molecule, water, a polyvalent alcohol, and an electrolyte salt, wherein a laminate of the adhesive hydrogel with an Ag/AgCI sheet exhibits the impedance of 1 Ω to 100 Ω at the frequency of 0.1 Hz measured in accordance with the method of ANSI/AAMI EC12:2000, and the dynamic elastic modulus G' at the frequency of 1 Hz measured at 25°C and dispersed frequencies is 1.0×10 3 Pa to 1.0×10 4 Pa, wherein the dynamic elastic modulus G' of a sample is measured using a dynamic viscoelastometer, wherein the sample is prepared by stamping the adhesive hydrogel to form pieces of 25 mmφ and superposing the pieces to a thickness of 0.6 mm; (ii) an insulating layer superposed on the surface of the adhesive hydrogel; and (iii) an electrode element superposed on the surface of the insulating layer; wherein the insulating layer is penetrated in a partial region, and the adhesive hydrogel is brought into direct contact with the electrode element in the partial region, a connector comprising a cord that transmits signals is connectable to the electrode element, and the position in the region where the electrode element is brought into direct contact with the adhesive hydrogel is offset in the extension direction of the cord of the connector. (i) an adhesive hydrogel comprising a polymer matrix prepared by crosslinking-copolymerization of an acrylamide derivative, which is a nonionic polymerizable monomer comprising a polymerizable carbon-carbon double bond in a molecule, and polyfunctional (meth)acrylamide, which is a crosslinkable monomer comprising 2 or more polymerizable carbon-carbon double bonds in a molecule, water, a polyvalent alcohol, and an electrolyte salt, wherein a laminate of the adhesive hydrogel with an Ag/AgCI sheet exhibits the impedance of 1 Ω to 100 Ω at the frequency of 0.1 Hz measured in accordance with the method of ANSI/AAMI EC12:2000, and the dynamic elastic modulus G' at the frequency of 1 Hz measured at 25°C and dispersed frequencies is 1.0×10 3 Pa to 1.0×10 4 Pa, wherein the dynamic elastic modulus G' of a sample is measured using a dynamic viscoelastometer, wherein the sample is prepared by stamping the adhesive hydrogel to form pieces of 25 mmφ and superposing the pieces to a thickness of 0.6 mm; wherein a laminate of the adhesive hydrogel with an Ag/AgCI sheet exhibits the impedance of 1 Ω to 100 Ω at the frequency of 0.1 Hz measured in accordance with the method of ANSI/AAMI EC12:2000, and the dynamic elastic modulus G' at the frequency of 1 Hz measured at 25°C and dispersed frequencies is 1.0×10 3 Pa to 1.0×10 4 Pa, wherein the dynamic elastic modulus G' of a sample is measured using a dynamic viscoelastometer, wherein the sample is prepared by stamping the adhesive hydrogel to form pieces of 25 mmφ and superposing the pieces to a thickness of 0.6 mm; (ii) an insulating layer superposed on the surface of the adhesive hydrogel; and (iii) an electrode element superposed on the surface of the insulating layer; wherein the insulating layer is penetrated in a partial region, and the adhesive hydrogel is brought into direct contact with the electrode element in the partial region, a connector comprising a cord that transmits signals is connectable to the electrode element, and the position in the region where the electrode element is brought into direct contact with the adhesive hydrogel is offset in the extension direction of the cord of the connector. the insulating layer is penetrated in a partial region, and the adhesive hydrogel is brought into direct contact with the electrode element in the partial region, a connector comprising a cord that transmits signals is connectable to the electrode element, and the position in the region where the electrode element is brought into direct contact with the adhesive hydrogel is offset in the extension direction of the cord of the connector.