A hair dryer includes a main dryer unit having a dryer outlet and a nozzle which is mounted on the main dryer unit. The nozzle includes a nozzle body and a rotational body. The nozzle body has a first end portion, a second end portion, and an engagement structure provided on the first end portion and is arranged for connecting to the air outlet of the hair dryer. The rotational body has an air-flowing channel longitudinally extended along an axis of the rotational body, an outer rotational surface, and a plurality of through air outlets provided on the outer rotational surface and is communicated with the air-flowing channel, wherein the rotational body is mounted at the second end portion of the nozzle body for allowing hair to be curled on the rotational surface and dried by air blowing out of the air outlets.