The invention concerns a device for washing nasal cavities by a nebulised liquid, that comprises a main body (12), a tank for liquids (14) possibly subdivided into a nebulisation chamber (23) and a collection chamber (24) of the substances returning from the nasal cavities, and means of collection and nebulisation of the treatment liquid from said nebulisation chamber and delivery of the nebulised 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) is housed in said cavity in communication, on one part, with the outside by means of an intake passage (21) and, on the other part, with said means of collecting and nebulisation of the treatment liquid by means of a delivery nozzle (21').
