PROBLEM TO BE SOLVED: To provide an expandable aerosol composition capable of forming a foam having good foam quality even with a stock solution blended many oily base materials, blending a compressed gas with high concentration, further reducing flammability, and reducing a discharge amount of volatile organic compounds (VOC) by containing a small amount of a liquid gas and the compressed gas as propellants.SOLUTION: The problem is solved with an expandable aerosol composition containing a raw liquid containing an oily raw material and a surfactant, a propellant containing a liquid gas and a compressed gas, and of which the oily raw material is contained 50 to 99 mass% in the raw liquid, the liquid gas is contained 0.05 to 8 mass% in the expandable aerosol composition.
