Accessory for use together with hair dryers including a hollow part and a monobloc, preferably obtained from an injected piece of plastic which has a connection terminal. The connection terminal has a tubular body and is dimensioned for coupling by locking to an end of a hair dryer. The connection terminal is disposed in an intermediate chamber. A plurality of hollow projections extend from the connection terminal. Each of the hollow projections diverts an air flow from the hair dryer to a series of openings disposed in the hollow projections and the body of the intermediate chamber.