Patent ID: 8208676

Claim:
An earpiece comprising: a main unit having a cylindrical shape having made therein a through hole that can allow sound to be transmitted therethrough; a cap portion that has a film-like shape which is formed to extend from all around a front-end surface, in a direction of making the through hole, of the main unit toward a rear-end surface side, and which covers at least a portion of the main unit on the front-end surface side, and in which space between the main unit and the cap portion expands as the cap portion extends toward the rear-end surface side; and at least one cutting portion formed in the cap portion so that the cap portion can deform in a direction of the main unit, wherein at least two cutting portions are formed from an end of the cap portion on the rear-end surface side toward the front-end surface side, and the cap portion is divided into two or more cap pieces which are connected to each other on the front-end surface side, and wherein, prior to insertion of the earpiece into a user's ear, the cutting portions are formed in a length shorter than a length of the cap portion from the rear-end surface side to the front-end surface side.