A cooking apparatus having a body, one or more heating units, a grill unit, and a heat reflecting unit. The heating units are arranged between the grill unit and the heat reflecting unit. The heat reflecting unit has front and rear plates, side plates, and a pair of inner reflecting plates and a pair of outer reflecting plates. The inner reflecting plates are upwardly projected to be higher than the outer reflecting plates. The front plate includes an upper surface and inner and outer surfaces, and is provided in the upper surface thereof with a water inlet, and in the inner surface thereof with an overflow hole. The front plate has a water level window to ascertain a level of water. The front plate is positioned outside the body so that oil and sauce are prevented from entering the inner space of the heat reflecting unit through the water inlet.