PURPOSE: To set the directions or angles of a transmission part and a reception part in the optimum states, to adjust distance between them, and to prevent an ear from being given fatigue feeling due to speech for a long time.

CONSTITUTION: An armor case 32 whose outer surface is inclined is mounted in a way of capable of rotating at the outside the transmission part 11 and the reception part 12. In addition to that, the transmission part 11 and the reception part 12 are mounted on both terminals of a holding part 10 formed capable of being bent by a flexible pipe in such a way that it can be turned, via a connection cylinder 15. Furthermore, a cover 40 wrapping a cushionning material 41 is mounted at the outside the transmission part 11 and the reception part 12.