NEBULIZER AND NEBULIZER KIT

A nebulizer kit (1) comprises: an atomizing portion (210) for generating an aerosol; and a particle sorting route (111, 121) that is in communication with the atomizing portion, and is for sorting particles of the liquid included in the aerosol so as to adjust a particle diameter distribution of the particles of the aerosol, and thereafter guiding the aerosol to a discharge port. The particle sorting route includes: a first particle sorting route (111) that has a substantially uniform cross-sectional area in the first direction; and a second particle sorting route (121) that has an inner end wall (123) that curves from the first direction toward a second direction included in substantially the same plane as the first direction. The first particle sorting route guides the aerosol to the second particle sorting route in the first direction, and the inner end wall of the second particle sorting route guides the aerosol in the second direction while particles with a particle diameter of a certain value or more among the particles of the aerosol are attached thereto.