To provide an earphone with adjustable area of sound holes on a housing behind a speaker, the structure of which changes sound field characteristics of an earphone body.

The earphone with the adjustable area of the sound holes on the housing behind the speaker is provided, which includes a speaker unit, a housing, and a cover plate. The speaker unit is covered by the housing having at least one adjustable sound hole located thereon behind the speaker unit. In addition, the cover plate is disposed on the housing and used to selectively cover at least one of the adjustable sound holes. The cover plate is a pivoting plate or a sliding plate for adjusting the exposed area of the adjustable sound holes, such that the frequency response of the sound sent by the speaker unit varies depending upon the requirements of customers.