The invention concerns a device for washing nasal cavities by a nebulized liquid, that comprises a main body (12), a tank for liquids (14) including at least a nebulization chamber (23), and means of collection and nebulization of the treatment liquid from said nebulization chamber and delivery of the nebulized liquid towards the nasal cavities with the help of a flow of air under pressure generated by a compressor group. The main body (12) has a cavity and the compressor group (18), a piloting electronic circuit (20) and an electric battery system (31) are all on board of a single support housed and retained in the cavity of said main body.
