A headphone device includes a sound amplifying member, a connecting member and a fixing member. The sound amplifying member includes a first speaker and a second speaker for outputting a sound. The connecting member is interconnected between the first speaker and the second speaker and made of first flexible material. The connecting member is flexibly wound around the first speaker and the second speaker. The fixing member is coupled to the sound amplifying member for securing the connecting member thereon after the connecting member is wound around the first speaker and the second speaker.