An aerosol transfer device (10) comprising a shaped aerosol accumulation chamber (12) having a central vertical axis (AA), an upper end (12A) and a lower end (12C), presenting the chamber (12 ) a main dimension, the upper end (12A) comprising a nebulizer port (24) and a patient applicator port (26), the lower end (12C) comprising an air inlet port (20), wherein the air inlet port (20) is oriented so that it is not aligned with said central vertical axis (AA), said air inlet port (20) also comprising a valve (32), an outer casing body (50) , which substantially surrounds at least said lower end (12C) of the aerosol accumulation chamber (12), the outer shell (50) having one or more air inlet passages (56) around a periphery thereof, in where said one or more air intake steps (56) is above said air inlet port (20), said patient applicator port (26) being in connection for fluid circulation with a patient application device (16), and an aerosol exhaust port ( 104) located in an intermediate position to said patient application device (16) and said patient applicator port (26), and in which the device is adapted to nebulize a medicament through said nebulizer port (24) generating an aerosol plume, and the accumulation chamber (12) is configured and sized so that, after inhalation by a patient, the ambient air is introduced into the device (10) through the air inlet passage (56) , from there it passes to the aerosol accumulation chamber (12) through which it flows countercurrently to said aerosol plume, thereby administering the aerosol to the patient effectively.Un dispositivo de transferencia de aerosol (10) que comprende una cámara de acumulación de aerosol conformada (12) que presenta un eje vertical central (AA), un extremo superior (12A) y un extremo inferior (12C), presentando la cámara (12) una dimensión principal, comprendiendo el extremo superior (12A) un puerto del nebulizador (24) y un puerto del aplicador para el paciente (26), comprendiendo el extremo inferi
