An aerosol generator with an active liquid container and a nebulization chamber associated therewith, which is connected to an inlet channel for the supply of carrier gas and to an outlet channel for the discharge of carrier gas mixed with aerosol obtained from the active liquid, is intended to enable a particularly good adjustability of the droplet size of the aerosols contained in the discharged carrier gas and thus a use particularly in the context of a transnasal inhalation therapy. For this purpose, the nebulization chamber has a substantially rotationally symmetrical boundary wall, the inlet channel being positioned and oriented in the region of its point of entry into the nebulization chamber in such a way that its longitudinal axis is offset relative to the axis of symmetry of the nebulization chamber in the region of the point of entry and does not intersect the axis of symmetry.