Flexible sheet electrode, wearable bioelectrode, and biosensor

A flexible sheet electrode comprising:

• a flexible base material;
• and
• an elastomer electrode layer provided over the flexible base material,
• wherein the elastomer electrode layer is formed over an outside of the flexible base material and includes a lamination layer including a conductive elastomer layer, and
• in a case where a tensile test is performed on the flexible sheet electrode according to the following procedure, a 100% tensile test force is greater than or equal to 5.0 N and less than or equal to 10.0 N,
• (procedure)
• a sample test piece having a rectangular shape is prepared from the flexible sheet electrode,
• in a case where the elastomer electrode layer of the sample test piece is held by chucks of a tensile testing machine such that a center of the elastomer electrode layer is positioned at a center between the chucks, and a distance between the chucks is elongated from 0% to 250% under a condition of a tensile rate of 250 mm/min, a tension (N) is measured during extension of the distance by X %, and a value of the tension is defined as the X % tensile test force.