A delivery device (1) of an aerosol-shaped substance, suitable for use in combination with a container (102) of the substance in liquid form and with a manually operated means (103) suitable for expelling the substance from the container ( 102), in particular in combination with a syringe (101), the delivery device (1) comprising: - a connection means (4), suitable for connecting the device (1) with the container (102)； - an elongated outer body (2) carrying a nozzle (53) for dispensing the substance in aerosol form； - an inner body (3), received inside said outer body (2)； and - a dynamic fluid path (5) comprised between said connection means (4) and said dispensing nozzle (53) and defined between said outer body (2) and said inner body (3), the path (5) being configured of such that, during use, a manual actuation of said actuating means (103) causes the substance to enter in liquid form in said dynamic fluid path (5) through said connecting means (4) and the output of the substance in the form of an aerosol (53) through said dispensing nozzle (53), the dynamic fluid path (5) comprising - an expansion chamber (50), arranged immediately downstream of said connecting means (4) with respect to to the flow of the substance inside the device (1) and having a substantially annular geometry； - an acceleration chamber (52), arranged immediately downstream of said expansion chamber (50) with respect to the flow of the substance into the device (1) and having a substantially elongated geometry, the acceleration chamber (52) being developed according to a longitudinal direction (L) substantially parallel to an axis of said annular expansion chamber (50) and / or a longitudinal axis (L) of the device.Un dispositivo de suministro (1) de una sustancia en forma de aerosol, apto para usarse en combinación con un envase (102) de la sustancia en forma líquida y con un medio de accionamiento manual (103) apto para expulsar la sustancia del envase (102), en particular en combinación
