The heating cooker includes: a heating compartment having a bottom tray mounted at the bottom part; a light source provided on the upper side of the heating compartment; a light-receiving element for receiving light transmitted by the bottom tray out of the light emitted from the light source, the light-receiving element being provided on the lower side of the bottom tray; and a determining part for determining, on the basis of a light-reception signal detected by the light-receiving element, the presence/absence or the size of a heating object placed on the bottom tray in the heating compartment. Thus, a heating cooker capable of preventing leakage of steam and detecting the presence/absence of food in the heating compartment, even when heat cooking using steam is performed, is provided.