A cooking apparatus which allows an interior of a cabinet thereof to be easily cleaned. The cooking apparatus includes a cabinet. The cabinet has an opening in a top surface defining a heating space. A heating unit to heat food is installed in the heating space and heat is transmitted from the heating unit to the food. A grill unit is seated on the top surface of the cabinet to support the food over the opening. A contamination preventing unit is installed in the heating space to prevent an inside surface of the cabinet from being contaminated with material dropping from the food. The cooking apparatus of the present invention guides splashed material back to a tray when the material collides with the tray splashes. The contamination preventing unit may be removed from the heating space, enabling a user to easily clean the contamination preventing unit.