A fragrance diffuser, particularly for small spaces, comprising a main body which forms an expansion seat, a containment chamber, which is segregated from the remaining part of the main body for containing a fluid, and a membrane which faces the external environment and is at least partially proximate to the expansion seat at least one passage channel being interposed between the containment chamber and the expansion seat, provided internally with at least one barrier partition for the fluid. The fragrance diffuser has a closed configuration in which the partition is active to stop the passage of the fluid from the containment chamber to the expansion seat and a configuration for use in which the partition is inactive for the passage of the fluid from the containment chamber to the membrane, passing through the expansion seat.
