PROBLEM TO BE SOLVED: To bring a measurement electrode for measuring an eye potential into pressure contact with a position close to an eyeball while reducing a device size.SOLUTION: An eye potential measuring device mounted on the ear of a user includes a first support part, a second support part continuously provided to the first support part, which is provided in a state to form a holding part for holding at least a portion of the ear of the user when mounted, between itself and the first support part, a measuring electrode provided to the first support part for measuring the eye potential of the user, a reference electrode provided at a position away from the measuring electrode, and an ear pad part provided to either the first support part or the second support part, which is inserted into the external auditory meatus hole of the user when mounted.SELECTED DRAWING: Figure 1【課題】装置を小型化しつつ、眼球に近い位置に眼電位を測定する測定電極を圧接することを課題とする。【解決手段】眼電位測定装置は、使用者の耳に装着される眼電位測定装置であって、第１支持部と、前記第１支持部に連設され、前記第１支持部との間に、装着時に少なくとも前記使用者の耳の一部分を挟持する挟持部を形成する状態に設けられている第２支持部と、前記第１支持部に設けられ、前記使用者の眼電位を測定する測定電極と、前記測定電極から離れた位置に設けられている基準電極と、前記第１支持部と前記第２支持部のいずれか一方に設けられ、装着状態となるときに前記使用者の外耳道孔に挿入されるイヤーパッド部と、を備える。【選択図】図１
