Abstract: A portable aerosol-type-fire-fighting protection device comprises a hollow body (1) which includes in the interior (10) thereof, and communicating with the exterior by way of an opening (3), a chamber (11) for accommodating a solid substance (7) capable of being transformed at a given temperature into an aerosol with flame-extinguishing properties and being discharged as such by way of the opening. A handle (2) is fixed with respect to the body and within its interior there is a space. The accommodating chamber has an electrical resistor (12) for triggering the transformation from solid into aerosol, energised by way of a switch (13) from batteries (14) accommodated in the space (15) in the handle.