An audiphone, characterized by comprising: an extracorporeal unit comprising: an extracorporeal transmitter coil; and a microphone; and an intracorporeal unit comprising: an interlinked intracorporeal receiver coil; a transducer made of a rod-shaped giant magnetostrictive element; a transducer driving coil wound on the transducer; and an operating point set up unit (48A, 48B) made of a permanent magnet; wherein in use of the audiphone: said extracorporeal unit is adapted to generate a transmission magnetic flux using said extracorporeal transmitter coil on the basis of an audible sound modulation transmission signal that is obtained by amplitude-modulating a carrier wave signal with the use of a sound collection signal obtained from said microphone; and the intracorporeal unit is adapted to generate an induced electromotive force signal with the use of the transmission magnetic flux coming from the extracorporeal unit and obtained from said interlinked intracorporeal receiver coil, expanding and contracting said transducer with the use of the induced electromotive force, and therefore in use, supplying vibrations corresponding to the sound collection signal, wherein: said induced electromotive force signal obtained from the intracorporeal receiver coil is supplied to said transducer driving coil in order to make an excitation magnetic field pass through the rod-shaped giant magnetostrictive element in a length direction, and the transducer expands and contracts in the length direction as a result; and a bias magnetic field is added to the excitation magnetic field in the length-direction of the rod-shaped giant magnetostrictive element with the use of said operating point setup unit (48A, 48B) such that an amplitude demodulation circuit is omitted because of a self-demodulation function of the rod-shaped giant magnetostrictive element. an extracorporeal unit comprising: an extracorporeal transmitter coil; and a microphone; and an extracorporeal transmitter coil; and a microphone; and an intracorporeal unit comprising: an interlinked intracorporeal receiver coil; a transducer made of a rod-shaped giant magnetostrictive element; a transducer driving coil wound on the transducer; and an operating point set up unit (48A, 48B) made of a permanent magnet; an interlinked intracorporeal receiver coil; a transducer made of a rod-shaped giant magnetostrictive element; a transducer driving coil wound on the transducer; and an operating point set up unit (48A, 48B) made of a permanent magnet; said extracorporeal unit is adapted to generate a transmission magnetic flux using said extracorporeal transmitter coil on the basis of an audible sound modulation transmission signal that is obtained by amplitude-modulating a carrier wave signal with the use of a sound collection signal obtained from said microphone; and the intracorporeal unit is adapted to generate an induced electromotive force signal with the use of the transmission magnetic flux coming from the extracorporeal unit and obtained from said interlinked intracorporeal receiver coil, expanding and contracting said transducer with the use of the induced electromotive force, and therefore in use, supplying vibrations corresponding to the sound collection signal, wherein: said induced electromotive force signal obtained from the intracorporeal receiver coil is supplied to said transducer driving coil in order to make an excitation magnetic field pass through the rod-shaped giant magnetostrictive element in a length direction, and the transducer expands and contracts in the length direction as a result; and a bias magnetic field is added to the excitation magnetic field in the length-direction of the rod-shaped giant magnetostrictive element with the use of said operating point setup unit (48A, 48B) such that an amplitude demodulation circuit is omitted because of a self-demodulation function of the rod-shaped giant magnetostrictive element. said induced electromotive force signal obtained from the intracorporeal receiver coil is supplied to said transducer driving coil in order to make an excitation magnetic field pass through the rod-shaped giant magnetostrictive element in a length direction, and the transducer expands and contracts in the length direction as a result; and a bias magnetic field is added to the excitation magnetic field in the length-direction of the rod-shaped giant magnetostrictive element with the use of said operating point setup unit (48A, 48B) such that an amplitude demodulation circuit is omitted because of a self-demodulation function of the rod-shaped giant magnetostrictive element.