To provide a code structure of an earphone whose housing is simple, and whose cost performance is satisfactory by preventing the code from getting entangled.

A code part electrically connecting an earphone with a plug is formed with a plurality of specific parts 32A to 32Z (32ZR and 23ZL) whose bending is more hardly generated than normal code parts 31A to 32Z (31ZR, 31ZL) with predetermined intervals. Those specific parts are configured so that the thickness of the code part is made thicker than the other sites, and that the code part is coated with reinforcing materials such as metal, plastic, paper and organic/inorganic substances or the like.