A headset comprises a body portion (4) including a microphone section (15), a receiver section (14), a battery section (12) and a wireless communication section (13), all provided in a case (1) havingA headset comprises a body portion (4) including a microphone section (15), a receiver section (14), a battery section (12) and a wireless communication section (13), all provided in a case (1) having a substantially flat surface (2a), and a projecting portion (11) projecting from the substantially flat surface (2a), is arranged such that the ear pad (17) of the receiver section (14) attached to ta substantially flat surface (2a), and a projecting portion (11) projecting from the substantially flat surface (2a), is arranged such that the ear pad (17) of the receiver section (14) attached to the tip of the projecting portion (11) is inserted into the external auditory meatus. A portion (16) coming into resilient contact with the inner wall of the cavity of the concha on the inside of a trahe tip of the projecting portion (11) is inserted into the external auditory meatus. A portion (16) coming into resilient contact with the inner wall of the cavity of the concha on the inside of a tragus and an antitragus is provided at the projecting portion closer to the body portion (4) side than the ear pad (17), wherein the ear pad (17) is of an earplug type deformable elastically to ensure agus and an antitragus is provided at the projecting portion closer to the body portion (4) side than the ear pad (17), wherein the ear pad (17) is of an earplug type deformable elastically to ensure aclose contact with the inner wall of the external auditory meatus. close contact with the inner wall of the external auditory meatus.