Abstract: A heater module for an aerosol generating device includes a heater module body detachably coupled to a cartridge which includes an aerosol generating material and having an inlet hole through which external air is introduced, a wick including a first surface that faces the inlet hole and extends in a direction crossing another direction in which air is introduced through the inlet hole and arranged in the heater module body to absorb the aerosol generating material, and a heater provided on the first surface of the wick to face the inlet hole and heating the aerosol generating material absorbed in the wick.

Abstract: A heater assembly includes a chamber including an air inlet, a liquid inlet, and an air outlet; a wick configured to absorb an aerosol generating material from outside of the heater assembly through the liquid inlet and including a first surface, a second surface, and a side surface surrounding a space between the first surface and the second surface; a heater arranged on the side surface of the wick and configured to heat the aerosol generating material absorbed into the wick; and a guide structure configured to induce external air flowing into the chamber through the air inlet to move in a direction toward the heater.