A hybrid inflator includes a gas storage chamber filled with a pressurized gas, a chemical chamber filled with a gas generating chemical, and an initiator attached to the chemical chamber for igniting the chemical to generate a reaction gas. A gas outlet is formed to eject the pressurized gas and the reaction gas from the gas storage chamber, and a sealing plate is disposed in the gas storage chamber for separating the gas outlet from the gas storage chamber. A swirl forming device is disposed between the gas storage chamber and the chemical chamber for swirling the reaction gas from the chemical chamber and guiding the reaction gas into the gas storage chamber.