Provided is an aerosol generating device including: a battery configured to supply power; a heating body configured to heat an aerosol generating article; and an amplifier electrically connected to the battery and the heating body, wherein the amplifier is configured to amplify a power signal supplied from the battery using at least two switching elements to generate a first amplification signal, and eliminate a modulation frequency component and a harmonics component from the generated first amplification signal to generate a second amplification signal, and transmit the generated second amplification signal to the heating body, wherein each of the at least two switching elements has a capacitance of 5 nC or less or a resistance value of 15 mΩ or less. In addition, various embodiments identified through the specification are possible.