Aerosol-generating article and aerosol generation device used therewith

An aerosol generation device comprising:

• a housing configured to form an accommodation space in which an aerosol-generating article is accommodated;
• a heater part configured to heat the aerosol-generating article accommodated in the accommodation space,
• wherein the heater part includes an external heating element configured to heat the aerosol-generating article from outside and an internal heating element configured to heat the aerosol-generating article from inside,
• wherein the aerosol-generating article includes a tobacco rod, which is filled with tobacco granules, and a filter rod,
• wherein the tobacco rod includes a first filter segment, a second filter segment, and a cavity segment formed by the first filter segment and the second filter segment,
• wherein the tobacco granules are filled in the cavity segment, and
• wherein the external heating element includes a first external heating element configured to heat an upstream portion of the cavity segment and a second external heating element configured to heat a downstream portion of the cavity segment.