A hairdryer may be provided, the hairdryer comprising: a main body unit provided with a gas discharge unit through which a gas is discharged to the outside, and a handle unit extending from the main body unit, wherein the gas discharge unit comprises: a module power supply unit which is provided at the center of the gas discharge unit and is in contact with a diffuser coupled to the main body so as to supply electric power to the diffuser; and a coupling unit which is provided in an annular shape along the circumference of the gas discharge unit so as to surround the module power supply unit. The diffuser is coupled to the main body unit via the coupling unit, and the module power supply unit is provided to come into contact with the diffuser while facing the diffuser. As such, a user may easily couple the diffuser to the hairdryer. Also, the hairdryer can supply electric power to the diffuser so that the additional function of the diffuser can be easily carried out. That is, user's convenience can be improved.