A mobile telephone (6001, 6101, 6201, 6301, 6401, 6801, 7401, 7501, 8201) comprising: a) a mobile telephone upper edge unit including a right-ear cartilage conduction unit (6024, 6124, 6224, 6324, 6424, 7424, 8224, 8224a, 8224b, 8224c), a left-ear cartilage conduction unit (6026, 6126, 6326, 6426, 6226, 7426, 8226), and a linking unit (6027, 6127, 6227, 6327, 6427, 7427, 8227b) linking the right-ear cartilage conduction unit (6024, 6124, 6224, 6324, 6424, 7424, 8224) and the left-ear cartilage conduction unit (6026, 6126, 6226, 6326, 6426, 7426, 8226), the units being exposed at the mobile telephone surface; and b) a cartilage-conduction vibration source (2525, 2525p, 2525q, 8225) for transmitting vibration to the mobile telephone upper edge unit, wherein c) the vibration generated from the cartilage-conduction vibration source (1025, 2525, 2525p, 2525q,8225) and transmitted to the mobile telephone upper edge unit is conducted to the cartilage around the entrance part of the external auditory meatus from the at least one of the right-ear cartilage conduction unit (6024, 6124, 6224, 6324, 7424, 8224) and the left-ear cartilage conduction unit (6026, 6126, 6226, 6326, 7426, 8226), and air conduction sound is subsequently generated in the external auditory meatus from the surface of cartilage part of external auditory meatus, the air conduction sound then proceeding through the inside of the external auditory meatus to reach the tympanic membrane, and d1) a vibration isolating part (6065, 6165, 6265, 6365, 6465, 7465, 8201f) provided between the mobile telephone upper edge unit and other sections of the mobile telephone (6001, 6101, 6201, 6301, 6401, 7401, 7501, 8201), and d2) the cartilage-conduction vibration source (2525, 2525p, 2525q, 8225) is furnished to the inside of the mobile telephone upper edge unit in such a way as to have substantially no contact with other sections of the mobile telephone (6001, 6101, 6201, 6301, 6401, 7401, 7501, 8201). a) a mobile telephone upper edge unit including a right-ear cartilage conduction unit (6024, 6124, 6224, 6324, 6424, 7424, 8224, 8224a, 8224b, 8224c), a left-ear cartilage conduction unit (6026, 6126, 6326, 6426, 6226, 7426, 8226), and a linking unit (6027, 6127, 6227, 6327, 6427, 7427, 8227b) linking the right-ear cartilage conduction unit (6024, 6124, 6224, 6324, 6424, 7424, 8224) and the left-ear cartilage conduction unit (6026, 6126, 6226, 6326, 6426, 7426, 8226), the units being exposed at the mobile telephone surface; and b) a cartilage-conduction vibration source (2525, 2525p, 2525q, 8225) for transmitting vibration to the mobile telephone upper edge unit, wherein c) the vibration generated from the cartilage-conduction vibration source (1025, 2525, 2525p, 2525q,8225) and transmitted to the mobile telephone upper edge unit is conducted to the cartilage around the entrance part of the external auditory meatus from the at least one of the right-ear cartilage conduction unit (6024, 6124, 6224, 6324, 7424, 8224) and the left-ear cartilage conduction unit (6026, 6126, 6226, 6326, 7426, 8226), and air conduction sound is subsequently generated in the external auditory meatus from the surface of cartilage part of external auditory meatus, the air conduction sound then proceeding through the inside of the external auditory meatus to reach the tympanic membrane, and d1) a vibration isolating part (6065, 6165, 6265, 6365, 6465, 7465, 8201f) provided between the mobile telephone upper edge unit and other sections of the mobile telephone (6001, 6101, 6201, 6301, 6401, 7401, 7501, 8201), and d2) the cartilage-conduction vibration source (2525, 2525p, 2525q, 8225) is furnished to the inside of the mobile telephone upper edge unit in such a way as to have substantially no contact with other sections of the mobile telephone (6001, 6101, 6201, 6301, 6401, 7401, 7501, 8201).