A laundry drying machine includes: a cabinet, a drum disposed inside the cabinet and configured to accommodate a target object, a driving unit configured to rotate the drum, and an electric field generator spaced apart from the drum and configured to generate an electric field inside the drum. The drum includes: a drum body having a cylindrical shape and accommodating the target object, a ground electrode that is in contact with an outer circumferential surface of the drum body, and a support roller that is in contact with the outer circumferential surface and that is configured to, based on the drum body rotating, support the drum body in a direction of the ground electrode, and a shortest distance between a central axis of the support roller and the ground electrode is less than a sum of a diameter of the drum body and a radius of the support roller.