Disclosed is an earphone, comprising an earphone shell, a first sound hole, a second sound hole and a loudspeaker, wherein the surface of the earphone shell is provided with the first sound hole and the second sound hole, and the earphone shell is internally provided with a resonant cavity connecting the first sound hole and the second sound hole; the loudspeaker is arranged in the resonant cavity, and the loudspeaker is arranged corresponding to the first sound hole; the loudspeaker comprises a first sound production surface corresponding to the first sound hole and also a second sound production surface opposite the first sound production surface, and sound produced by the second sound production surface is transmitted to the second sound hole by means of the resonant cavity. According to the technical solution in the present application, the earphone can be worn by a user for a long time without discomfort such as ear swelling and the ear being pressed.