To normally spray without leakage of a compressed gas to the outside even when the sprayer is used at a slant and easily remove gas from the pressure-resistant container after the raw liquid has been used.

This aerosol sprayer is provided with a mountain cap 23 fitted to the opening 22 of a pressure-resistant container, a valve device 25 piercing the cap, and a spray button 26 fitted to the upper part of the valve device. Either compressed gas 30 or liquefied gas or both and a raw liquid 31 are injected in the pressure-resistant container 21 to freely jet the raw liquid from the jetting hole by the pressurized gas force. An extensible balloon charged with at least one of the compressed gas and the liquefied gas is contained in the pressure-resistant container 21 and the raw liquid is infected into the pressure-resistant container of the outside of the balloon and the pressurized gas is forced to act on the raw liquid through the balloon.