Provided is an aerosol fire extinguishing device having improved heat resistance and vibration resistance, and designed to be installable in a moving object such as a vehicle, and an aerosol fire extinguishing agent for use in the same. The aerosol fire extinguishing agent is an aerosol fire extinguishing agent comprising an oxidizing agent, a reducing agent, and a reducing agent/binder, to which a fluororubber is added in an outer percentage of 0.5-5 wt %. The aerosol fire extinguishing agent is an aerosol fire extinguishing agent comprising 60-85 wt % of potassium nitrate, 10-26.7 wt % of dicyandiamide, and 5-13.3 wt % of phenolic resin, to which a fluororubber is added in an outer percentage of 0.5-5 wt %. An aerosol tire extinguishing agent pellet is provided with a generally circular disk-shaped pellet press-molded from the aerosol fire extinguishing agent and having in the center thereof a fire extinguishing tool insertion hole, and with a restrictor made of soft rubber applied onto the outer surface of the pellet. The aerosol fire extinguishing device is provided with the aerosol fire extinguishing agent pellet.