A heating cooker capable of evenly supplying steam from a steam generator into a cooking cavity. The heating cooker includes a cooking cavity, a steam generator to supply steam into the cooking cavity, and food racks installed in the cooking cavity to support food thereon. Each of the food racks is fabricated with a pipe having a plurality of steam discharging holes so that the steam is fed into each of the food racks. Thus, the heating cooker allows the steam to be distributed through entire portions of the food racks to allow the steam to be evenly discharged into the cooking cavity.