A conductor (42a) of an audio pin cable is electrically and mechanically connected at both ends thereof to the terminals inside of pin plugs (41a, 45a). A vibration attenuating member such as a cross section-enlarging member (43a) is joined at the middle portion of the conductor (42a) . The conductor (42a) and the cross section-enlarging member (43a) are coated around the periphery with an insulating member (44a). When a longitudinal wave passes through the conductor (42a), the cross section-enlarging member (43a) attenuates the longitudinal vibration transmission through the audio pin cable, thus achieving reproduced sounds as close to the original sounds as possible.