A microfluidic dispenser device for delivering inhalable substances comprising: a casing (2; 102); a driving circuit (3; 103), housed in the casing (2; 102); a microfluidic cartridge (5; 105), housed in the casing (2; 102) and having a tank containing a liquid (L; L') to be delivered; wherein the microfluidic cartridge (5; 105) is provided with at least one nebuliser controlled by the driving device (3; 103) and comprising: a substrate; a chamber layer on the substrate; a plurality of chambers formed on the substrate in the chamber layer and fluidically coupled to the tank for receiving the liquid (L; L') to be delivered; a plurality of heaters, which are formed on the substrate in positions corresponding to respective chambers, are thermally coupled to the respective chambers, and are separated from the respective chambers by an insulating layer, the heaters being controlled by the driving device; and at least one nozzle for each chamber, the nozzle fluidically connecting the respective chamber to the outside of the nebuliser; wherein the nebuliser comprises supply passages fluidically coupled to the tank and wherein the chambers are fluidically coupled to respective supply passages by means of respective microfluidic channels; wherein the chambers are aligned along edges of the supply passages and are evenly distributed; characterized in that the supply passages are circular and concentric and define annular frame regions that comprise respective portions of the substrate, of the insulating layer, and of the chamber layer and are also concentric. a casing (2; 102); a driving circuit (3; 103), housed in the casing (2; 102); a microfluidic cartridge (5; 105), housed in the casing (2; 102) and having a tank containing a liquid (L; L') to be delivered; wherein the microfluidic cartridge (5; 105) is provided with at least one nebuliser controlled by the driving device (3; 103) and comprising: a substrate; a chamber layer on the substrate; a plurality of chambers formed on the substrate in the chamber layer and fluidically coupled to the tank for receiving the liquid (L; L') to be delivered; a plurality of heaters, which are formed on the substrate in positions corresponding to respective chambers, are thermally coupled to the respective chambers, and are separated from the respective chambers by an insulating layer, the heaters being controlled by the driving device; and at least one nozzle for each chamber, the nozzle fluidically connecting the respective chamber to the outside of the nebuliser; wherein the nebuliser comprises supply passages fluidically coupled to the tank and wherein the chambers are fluidically coupled to respective supply passages by means of respective microfluidic channels; wherein the chambers are aligned along edges of the supply passages and are evenly distributed; characterized in that the supply passages are circular and concentric and define annular frame regions that comprise respective portions of the substrate, of the insulating layer, and of the chamber layer and are also concentric. a substrate; a chamber layer on the substrate; a plurality of chambers formed on the substrate in the chamber layer and fluidically coupled to the tank for receiving the liquid (L; L') to be delivered; a plurality of heaters, which are formed on the substrate in positions corresponding to respective chambers, are thermally coupled to the respective chambers, and are separated from the respective chambers by an insulating layer, the heaters being controlled by the driving device; and at least one nozzle for each chamber, the nozzle fluidically connecting the respective chamber to the outside of the nebuliser; wherein the nebuliser comprises supply passages fluidically coupled to the tank and wherein the chambers are fluidically coupled to respective supply passages by means of respective microfluidic channels; wherein the chambers are aligned along edges of the supply passages and are evenly distributed; characterized in that the supply passages are circular and concentric and define annular frame regions that comprise respective portions of the substrate, of the insulating layer, and of the chamber layer and are also concentric.