Abstract: A device capable of recording a bioelectrical signal under the normal living conditions of a living body is arranged so that an extremely real record can be obtained not only during a walk, a meal or a sleep of the living body but also even during bathing. A base member having flexibility which permits it to follow the motion of the living body is provided with electrodes for picking up electrical signals of the living body and a recording element for recording the picked-up electrical signals. If the base member is stuck on the living body, the electrodes pick up the electrical signals of the living body and the picked-up electrical signals are recorded in the recording element. When the base member is stuck on the living body, the base member watertightly covers the electrodes. Accordingly, even if the living body is surrounded by water, the electrodes can pick up the electrical signals of the living body without touching the water.