A laundry drying machine comprising: a cabinet; a drum rotatably installed inside the cabinet and configured to accommodate a subject to be dried; a driving unit configured to rotate the drum; and an electric field generator that is spaced apart from the drum and is configured to generate an electric field inside the drum when power is applied, wherein the drum includes: a drum body that is formed in a cylindrical shape and is configured to accommodate the subject to be dried therein; a ground electrode adapted to be in contact with an outer circumferential surface of the drum body; and a support roller adapted to be in contact with the outer circumferential surface of the drum body and is configured to support the outer circumferential surface of the drum body in the direction of the ground electrode when the drum body is rotated, wherein the shortest distance between a central axis of the support roller and the ground electrode is shorter than the sum of a diameter of the drum body and a radius of the support roller, wherein the ground electrode includes a ground pin that has one side connected to the cabinet and is formed with a curved pin spring structure, and the drum body is in contact with the ground pin, wherein two or more ground pins are provided along an axial direction of the drum body, and characterized in that a contact point between the drum body and the support roller and a contact point between the drum body and the two or more ground pins are symmetrical with each other with respect to a central axis of the drum body. a cabinet; a drum rotatably installed inside the cabinet and configured to accommodate a subject to be dried; a driving unit configured to rotate the drum; and an electric field generator that is spaced apart from the drum and is configured to generate an electric field inside the drum when power is applied, wherein the drum includes: a drum body that is formed in a cylindrical shape and is configured to accommodate the subject to be dried therein; a ground electrode adapted to be in contact with an outer circumferential surface of the drum body; and a support roller adapted to be in contact with the outer circumferential surface of the drum body and is configured to support the outer circumferential surface of the drum body in the direction of the ground electrode when the drum body is rotated, wherein the shortest distance between a central axis of the support roller and the ground electrode is shorter than the sum of a diameter of the drum body and a radius of the support roller, wherein the ground electrode includes a ground pin that has one side connected to the cabinet and is formed with a curved pin spring structure, and the drum body is in contact with the ground pin, wherein two or more ground pins are provided along an axial direction of the drum body, and characterized in that a contact point between the drum body and the support roller and a contact point between the drum body and the two or more ground pins are symmetrical with each other with respect to a central axis of the drum body. a drum body that is formed in a cylindrical shape and is configured to accommodate the subject to be dried therein; a ground electrode adapted to be in contact with an outer circumferential surface of the drum body; and a support roller adapted to be in contact with the outer circumferential surface of the drum body and is configured to support the outer circumferential surface of the drum body in the direction of the ground electrode when the drum body is rotated, wherein the shortest distance between a central axis of the support roller and the ground electrode is shorter than the sum of a diameter of the drum body and a radius of the support roller, wherein the ground electrode includes a ground pin that has one side connected to the cabinet and is formed with a curved pin spring structure, and the drum body is in contact with the ground pin, wherein two or more ground pins are provided along an axial direction of the drum body, and characterized in that a contact point between the drum body and the support roller and a contact point between the drum body and the two or more ground pins are symmetrical with each other with respect to a central axis of the drum body.