STEREO EARPHONE

PROBLEM TO BE SOLVED: To provide a stereo earphone of simple configuration.SOLUTION: An exfoliation-proof adhesive sheet is provided in a contact part between a cartilage conduction part and a conchal cartilage. The adhesive sheet is provided in a portion in contact with a cavity of concha. An ear plug part is provided at a position where the adhesive sheet is not disposed. As another configuration, the adhesive sheet is provided in the ear plug part. A plurality of elastic protrusions are provided around the cartilage conduction part so as to be in contact with the entrance of the external auditory meatus, thereby arbitrarily selecting one of the state where a gap is generated in the entrance of the external auditory meatus and the state where the external auditory meatus is closed by embedding the elastic protrusions in the cartilage conduction parts. In a common cartilage conduction part, a branch part settled within an inter-tragus incisure and an additional branch part settled within the incisure are provided. In sheath parts forming the branch part and the additional branch part, piezoelectric bimorph elements are provided, respectively, and different equalized audio signals are inputted, respectively. The piezoelectric bimorph elements are inserted into a connection part of the cartilage conduction part and the connection part is covered with the sheath parts from the outside.