BIOELECTRODE THAT CAN BE WORN FOR A LONG PERIOD OF TIME

A bioelectrode is provided that is formed such that, as a bioelectrode that prevents swelling of an electrolyte in the electrode portion, does not make measurement unstable or impossible due to falling off of the electrolyte from the electrode part or a living body surface even when the bioelectrode is worn for a long time, does not cause a feeling of discomfort such as itchiness, and further prevents a decrease in adhesive force, the bioelectrode includes an electrode portion that acquires an electric signal of a living body or outputs an electric signal to the living body, in which the electrode portion is provided with an electrolyte layer that is in close contact with the living body, and is also provided with a sheet-like cover member that covers at least a part or all of the electrolyte layer, the cover member being provided with an opening that penetrates in a thickness direction, thereby discharging moisture accumulated in the electrolyte layer and preventing the swelling and deterioration.