An aerosol generating device comprising: a battery configured to supply a battery voltage (V BAT) having a first voltage value; a first boost circuit configured to boost the battery voltage (V BAT) to a first boost voltage (V 1) having a second voltage value greater than the first voltage value; a second boost circuit configured to boost the first boost voltage (V 1) to a second boost voltage (V 2) having a third voltage value which is a peak-to-peak voltage value and is greater than the second voltage value; a vibrator configured to generate ultrasonic vibration according to the second boost voltage (V 2) and atomize an aerosol generating material; and a processor configured to control the battery, the first boost circuit, and the second boost circuit, characterized in that the second boost circuit comprises: a first inductor having one terminal to which the first boost voltage (V 1) is applied and another terminal connected to one terminal of the vibrator; a first power field-effect transistor configured to generate a first switching voltage (V SW_P) based on a first pulse width modulation signal (PWM_P) received from the processor; a first transistor connected to the other terminal of the first inductor and configured to switch a current flowing between the first inductor and a ground according to the first switching voltage (V SW_P), a second inductor having one terminal to which the first boost voltage (V 1) is applied and another terminal connected to another terminal of the vibrator; a second power FET configured to generate a second switching voltage (V SW_N) based on a second PWM signal (PWM_N) received from the processor; and a second transistor connected to the other terminal of the second inductor and configured to switch a current flowing between the second inductor and the ground according to the second switching voltage (V SW_N). a battery configured to supply a battery voltage (V BAT) having a first voltage value; a first boost circuit configured to boost the battery voltage (V BAT) to a first boost voltage (V 1) having a second voltage value greater than the first voltage value; a second boost circuit configured to boost the first boost voltage (V 1) to a second boost voltage (V 2) having a third voltage value which is a peak-to-peak voltage value and is greater than the second voltage value; a vibrator configured to generate ultrasonic vibration according to the second boost voltage (V 2) and atomize an aerosol generating material; and a processor configured to control the battery, the first boost circuit, and the second boost circuit, characterized in that the second boost circuit comprises: a first inductor having one terminal to which the first boost voltage (V 1) is applied and another terminal connected to one terminal of the vibrator; a first power field-effect transistor configured to generate a first switching voltage (V SW_P) based on a first pulse width modulation signal (PWM_P) received from the processor; a first transistor connected to the other terminal of the first inductor and configured to switch a current flowing between the first inductor and a ground according to the first switching voltage (V SW_P), a second inductor having one terminal to which the first boost voltage (V 1) is applied and another terminal connected to another terminal of the vibrator; a second power FET configured to generate a second switching voltage (V SW_N) based on a second PWM signal (PWM_N) received from the processor; and a second transistor connected to the other terminal of the second inductor and configured to switch a current flowing between the second inductor and the ground according to the second switching voltage (V SW_N). a first inductor having one terminal to which the first boost voltage (V 1) is applied and another terminal connected to one terminal of the vibrator; a first power field-effect transistor configured to generate a first switching voltage (V SW_P) based on a first pulse width modulation signal (PWM_P) received from the processor; a first transistor connected to the other terminal of the first inductor and configured to switch a current flowing between the first inductor and a ground according to the first switching voltage (V SW_P), a second inductor having one terminal to which the first boost voltage (V 1) is applied and another terminal connected to another terminal of the vibrator; a second power FET configured to generate a second switching voltage (V SW_N) based on a second PWM signal (PWM_N) received from the processor; and a second transistor connected to the other terminal of the second inductor and configured to switch a current flowing between the second inductor and the ground according to the second switching voltage (V SW_N).