To provide an energy-efficient baked sweet potato machine.

In a heating chamber 50 installed in a case 40, an electric heater 20, a radiation plate 30, and the first and second trays 10, 12 are arranged from top down. Furthermore, the first and second trays 10, 12 and the radiation plate 30 are stainless flat plates pressed to form triangular grooves periodically in cross-section. In the electric heater 20, the heating wire is formed in a serpentine shape which meanders with a curved part and another curved part connected with linear parts and the linear parts are arranged so that they may be along the triangle grooves of the radiation plate 30 and be parallel to the grooves vertically in the view from the first tray 10.