An aerosol generating source support assembly comprising: an inner cylinder which is hollow, having a support space, and arranged to surround and support at least a portion of an aerosol generating source; and an outer cylinder connected to the inner cylinder, and arranged to movably support the inner cylinder such that the inner cylinder moves between a coupling position in which the outer cylinder is coupled with the inner cylinder and a separation position in which at least a portion of the inner cylinder is separated from the outer cylinder; wherein the inner cylinder is rotatably coupled to the outer cylinder such that the inner cylinder rotates between the coupling position and the separation position, and wherein the inner cylinder is accommodated in the outer cylinder in the coupling position and at least a portion of the inner cylinder protrudes out of the outer cylinder in the separation position; or wherein the inner cylinder is movably coupled to the outer cylinder such that the inner cylinder moves with respect to the outer cylinder in a direction in which the outer cylinder extends, wherein the outer cylinder includes an outer cylinder cut-out hole for exposing at least a portion of the accommodation space to outside, wherein the inner cylinder includes an inner cylinder cut-out hole that exposes the support space to the outside and has a shape corresponding to the outer cylinder cut-out hole, and wherein both the outer cylinder cut-out hole and the inner cylinder cut-out hole are closed in the coupling position to form an aerosol generating source insertion space for accommodating the aerosol generating source, and the outer cylinder cut-out hole and the inner cylinder cut-out hole are exposed to the outside in the separation position. an inner cylinder which is hollow, having a support space, and arranged to surround and support at least a portion of an aerosol generating source; and an outer cylinder connected to the inner cylinder, and arranged to movably support the inner cylinder such that the inner cylinder moves between a coupling position in which the outer cylinder is coupled with the inner cylinder and a separation position in which at least a portion of the inner cylinder is separated from the outer cylinder; wherein the inner cylinder is rotatably coupled to the outer cylinder such that the inner cylinder rotates between the coupling position and the separation position, and wherein the inner cylinder is accommodated in the outer cylinder in the coupling position and at least a portion of the inner cylinder protrudes out of the outer cylinder in the separation position; or wherein the inner cylinder is movably coupled to the outer cylinder such that the inner cylinder moves with respect to the outer cylinder in a direction in which the outer cylinder extends, wherein the outer cylinder includes an outer cylinder cut-out hole for exposing at least a portion of the accommodation space to outside, wherein the inner cylinder includes an inner cylinder cut-out hole that exposes the support space to the outside and has a shape corresponding to the outer cylinder cut-out hole, and wherein both the outer cylinder cut-out hole and the inner cylinder cut-out hole are closed in the coupling position to form an aerosol generating source insertion space for accommodating the aerosol generating source, and the outer cylinder cut-out hole and the inner cylinder cut-out hole are exposed to the outside in the separation position.