A laundry dryer comprising: a main body having an inner space formed therein; a support body arranged in the main body to form a frame of the main body; a flexible drum having an open front face and an open rear face, wherein the flexible drum is rotatably arranged on the support body so as to have a non-circular cross-section; and rotation guides arranged between the support body and the flexible drum, and contacting the flexible drum so as to rotate and support the flexible drum while maintaining the non-circular cross-section of the flexible drum as the flexible drum rotates, wherein the rotation guides are fixed to the support body and contact a front end and a rear end of the flexible drum at a plurality of positions so as to guide rotation of the flexible drum, wherein each rotation guide includes: at least one rolling part rotatably installed on the support body so as to maintain rolling contact with a part of the front end or the rear end of the flexible drum as it rotates; and an installation part fixed to the support body such that the at least one rolling part is rotatably installed in the installation part characterized in that the at least one rolling part includes: a first rolling part contacting an inner surface of the front end or the rear end of the flexible drum and exerting an outward force on the flexible drum; and a second rolling part contacting an outer surface of the front end or the rear end of the flexible drum. a main body having an inner space formed therein; a support body arranged in the main body to form a frame of the main body; a flexible drum having an open front face and an open rear face, wherein the flexible drum is rotatably arranged on the support body so as to have a non-circular cross-section; and rotation guides arranged between the support body and the flexible drum, and contacting the flexible drum so as to rotate and support the flexible drum while maintaining the non-circular cross-section of the flexible drum as the flexible drum rotates, wherein the rotation guides are fixed to the support body and contact a front end and a rear end of the flexible drum at a plurality of positions so as to guide rotation of the flexible drum, wherein each rotation guide includes: at least one rolling part rotatably installed on the support body so as to maintain rolling contact with a part of the front end or the rear end of the flexible drum as it rotates; and an installation part fixed to the support body such that the at least one rolling part is rotatably installed in the installation part characterized in that the at least one rolling part includes: a first rolling part contacting an inner surface of the front end or the rear end of the flexible drum and exerting an outward force on the flexible drum; and a second rolling part contacting an outer surface of the front end or the rear end of the flexible drum. at least one rolling part rotatably installed on the support body so as to maintain rolling contact with a part of the front end or the rear end of the flexible drum as it rotates; and an installation part fixed to the support body such that the at least one rolling part is rotatably installed in the installation part characterized in that the at least one rolling part includes: a first rolling part contacting an inner surface of the front end or the rear end of the flexible drum and exerting an outward force on the flexible drum; and a second rolling part contacting an outer surface of the front end or the rear end of the flexible drum. a first rolling part contacting an inner surface of the front end or the rear end of the flexible drum and exerting an outward force on the flexible drum; and a second rolling part contacting an outer surface of the front end or the rear end of the flexible drum.