Patent ID: 8767995

Claim:
An earphone comprising: a sound wave generation means which generates sound waves depending on electric signals; a body including an enclosure which encloses the back of the sound wave generation means; and a worn portion in which a sound wave path for transmitting a sound wave to the external auditory canal is formed, and which is worn in the external auditory canal, wherein a communicating hole is formed in the enclosure so as to communicate with ambient air, and a open-close cap is mounted on the enclosure so as to open and close the communicating hole, an axial hole is formed in the body, an axis inserted into the axial hole is formed on the open-close cap, an adhered plane adherable to the communicating hole is provided in at least one part of the plane of the open-close cap facing the communicating hole, the adhered plane opens and closes the communicating hole according to the adhered plane's approach to and separation from the communicating hole a dome shaped protrusion corresponding to the position and size of the communicating hole is formed on at least one adhered plane formed at the axial position adherable to the communicating hole, and when the adhered plane approaches to the communicating hole, at least one part of the protrusion is inserted into the communicating hole simultaneously.