The present invention relates to a headphone which comprises a hanger and is respectively provided with a broadcasting device at the two ends. Each broadcasting device comprises the following components: a first casing; a second casing which is mutually combined with the first casing and is formed with a first gas vent between the first casing and the second casing, and is provided with a second gas vent that is different from the opening direction of first gas vent; a cover body which is combined with the second casing and is provided with a plurality of sound holes; and a speaker which is installed on the cover body and is positioned between the first casing and the second casing; wherein, when the speaker operates, the air current generated by sound wave is discharged out through the fist gas vent, the second gas vent and the sound holes, therefore the stable air displacement and high quality sound discharging effect are obtained.