An aerosol generating device is provided. The aerosol generating device according to the present disclosure comprises: a main body having a power source; a wick disposed at the main body; a heater connected to the power source and configured to heat the wick; a container detachably coupled to the main body and having a storage space in which an aerosol generating material is contained; a medium having a first end connected to the storage space of the container and a second end in contact with the wick, so as to transfer the aerosol generating material to the wick; a first sensor disposed at the main body and connected to the power source and configured to sense a coupling of the container to the main body; and at least one processor configured to determine whether to replace the heater based on a total number of times that the first sensor senses the coupling of the container to the main body.