An electric power transmission device comprising: a first power transmitting electrode having a planar surface arranged in a first plane; a second power transmitting electrode having a planar surface arranged in the first plane and spaced from the first power transmitting electrode in a first direction that extends in the first plane; and a power transmission circuit electrically connected to the first and second power transmitting electrodes (120a, 120b) and outputting AC power to the first and second power transmitting electrodes (120a, 120b); characterized by a conductive first shield disposed in the first plane between the first power transmitting electrode and the second power transmitting electrode spaced from each of the first power transmitting electrode and the second power transmitting electrode; a conductive second shield disposed in a second plane parallel to the first plane and spaced from each of the first and second power transmitting electrodes (120a, 120b) in a second direction perpendicular to the first plane, the second shield covering at least one of a first gap between the first power transmitting electrode and the first shield or a second gap between the second power transmitting electrode and the first shield, the second shield having at least three portions (160a1-160a3) arranged in a direction that extends in the second plane and is parallel to the first direction, the at least three portions including a first portion (160a1) that covers one of the first and second gaps, a second portion (160a2) that is spaced from the first portion (160a1) by a third gap and that faces one of the first and second power transmitting electrodes (120a, 120b), and a third portion (160a3) that is spaced from the first portion (160a1) by a fourth gap and that faces the first shield; and a conductive third shield disposed in a third plane parallel to the second plane and spaced from the second shield in the second direction, the third shield covering at least one of the third gap or the fourth gap. a first power transmitting electrode having a planar surface arranged in a first plane; a second power transmitting electrode having a planar surface arranged in the first plane and spaced from the first power transmitting electrode in a first direction that extends in the first plane; and a power transmission circuit electrically connected to the first and second power transmitting electrodes (120a, 120b) and outputting AC power to the first and second power transmitting electrodes (120a, 120b); characterized by a conductive first shield disposed in the first plane between the first power transmitting electrode and the second power transmitting electrode spaced from each of the first power transmitting electrode and the second power transmitting electrode; a conductive second shield disposed in a second plane parallel to the first plane and spaced from each of the first and second power transmitting electrodes (120a, 120b) in a second direction perpendicular to the first plane, the second shield covering at least one of a first gap between the first power transmitting electrode and the first shield or a second gap between the second power transmitting electrode and the first shield, the second shield having at least three portions (160a1-160a3) arranged in a direction that extends in the second plane and is parallel to the first direction, the at least three portions including a first portion (160a1) that covers one of the first and second gaps, a second portion (160a2) that is spaced from the first portion (160a1) by a third gap and that faces one of the first and second power transmitting electrodes (120a, 120b), and a third portion (160a3) that is spaced from the first portion (160a1) by a fourth gap and that faces the first shield; and a conductive third shield disposed in a third plane parallel to the second plane and spaced from the second shield in the second direction, the third shield covering at least one of the third gap or the fourth gap.