A pest control aerosol sprayer that is free from giving rise to a fire or a burn in its storage or use, includes a pressure-tight container receiving therein a noxious insect behavioral inhibitor of which an active ingredient is HFC-152a acting also as both a propellant and refrigerant. The pressure-tight container has at its top a valve having a stem, and the stem has an injection hole therein that can be opened with the stem forced down. A head cap is attached to a top of the pressure-tight container and is provided with a spray nozzle and an inflow port in which the stem of the valve in the pressure-tight container is fitted. The head cap has an injection passage leading from the inflow port to the spray nozzle.