A one-pack aqueous aerosol composition being highly secure against fire and enabling efficient adhesion of an active ingredient. This aerosol composition is a homogeneous one which comprise 10 to 60 wt % of a liquid concentrate consisting of 30 to 90 wt % of an oil such as kerosene, 5 to 50 wt % of a polyhydric alcohol such as diethylene glycol, 1 to 40 wt % of water, and 0.1 to 20 wt % of an active ingredient such as insecticide and not exhibiting any flash point at a pressure of 1 atm and 90 to 40 wt % of a propellant consisting of diethyl ether.