An aerosol generating source support assembly (4, 104) comprising: an inner cylinder (10, 110) which is hollow, having a support space and an insertion opening which opens the support space to the outside, and arranged to surround and support at least a portion of an aerosol generating source; and an outer cylinder (20, 120) which is hollow, having an accommodation space and a side opening for opening the accommodation space to the outside, connected to the inner cylinder (10, 110), and arranged to movably support the inner cylinder (10, 110) such that the inner cylinder (10, 110) moves between a coupling position in which the outer cylinder (20, 120) is coupled with the inner cylinder (10, 110) and a separation position in which at least a portion of the inner cylinder (10, 110) is separated from the outer cylinder (20, 120), wherein the inner cylinder (10, 110) and the outer cylinder (20, 120) are in the coupling position such that the insertion opening of the inner cylinder (10, 110) is aligned with the side opening of the outer cylinder (20, 120), and the insertion opening of the inner cylinder (10, 110) and the side opening of the outer cylinder (20, 120) form an insertion hole through which the aerosol generating source is inserted into the aerosol generating source support assembly (4, 104), and in a state that the aerosol generating source is inserted into the insertion opening, a part of the aerosol generating source is projected to the outside of the aerosol generating source support assembly (4, 104) such that a user may hold the projected part of the aerosol generating source to inhale aerosol, and wherein the inner cylinder is rotatably coupled to the outer cylinder, or wherein the inner cylinder is movably coupled to the outer cylinder such that the inner cylinder moves linearly with respect to the outer cylinder. an inner cylinder (10, 110) which is hollow, having a support space and an insertion opening which opens the support space to the outside, and arranged to surround and support at least a portion of an aerosol generating source; and an outer cylinder (20, 120) which is hollow, having an accommodation space and a side opening for opening the accommodation space to the outside, connected to the inner cylinder (10, 110), and arranged to movably support the inner cylinder (10, 110) such that the inner cylinder (10, 110) moves between a coupling position in which the outer cylinder (20, 120) is coupled with the inner cylinder (10, 110) and a separation position in which at least a portion of the inner cylinder (10, 110) is separated from the outer cylinder (20, 120), wherein the inner cylinder (10, 110) and the outer cylinder (20, 120) are in the coupling position such that the insertion opening of the inner cylinder (10, 110) is aligned with the side opening of the outer cylinder (20, 120), and the insertion opening of the inner cylinder (10, 110) and the side opening of the outer cylinder (20, 120) form an insertion hole through which the aerosol generating source is inserted into the aerosol generating source support assembly (4, 104), and in a state that the aerosol generating source is inserted into the insertion opening, a part of the aerosol generating source is projected to the outside of the aerosol generating source support assembly (4, 104) such that a user may hold the projected part of the aerosol generating source to inhale aerosol, and wherein the inner cylinder is rotatably coupled to the outer cylinder, or wherein the inner cylinder is movably coupled to the outer cylinder such that the inner cylinder moves linearly with respect to the outer cylinder.