Nebulizer comprising a main body (1), an atomiser (2) for atomising a liquid so as to expel the liquid as a spray of droplets from said nebulizer, and a vibrating element (22, 23). The atomiser comprises a substrate (4), a main recipient (16) supported by said substrate for containing said liquid and having a bottom surface, a flat top surface and an outer wall (16a) erecting from the top surface to delimit the liquid reservoir, and a dosing reservoir (18) arranged on said main recipient (16) so as to delimit a predetermined amount of said liquid to be expelled, and having a upper surface (18t) and a wall (18a) extending downwards from said upper surface (18t) towards main recipient (16), when assembled thereto.The dosing reservoir (18) comprising a hollow section (18c) defining said predetermined amount of liquid, a solid section (18d) extending downwards from said upper surface (18t), a central section (18e) being a hole traversing said upper surface (18t) and arranged in said solid section (18d), an orifice membrane plate (22) arranged at the bottom of said hole of said central section (18e), for sealing said hole, and a fluidic channel (21) arranged in-between a bottom surface of said solid section (18d) and said flat top surface of said main reservoir (16) so as to create a capillary communication between said hollow section (18c) and said orifice membrane plate (22).
