An earphone device comprises a casing, an earphone body and a switching unit. The casing includes an opening and an accommodating space, and the opening communicates with the accommodating space and an outside of the casing. The earphone body is disposed in the accommodating space. The switching unit is disposed on the casing. The switching unit can selectively seal or expose the opening to correspondingly switch the earphone device to an open-type earphone device or a closed-type earphone device.