To ensure good cooking by preventing radiation of heat from the window glass of a door thereby making uniform the temperature distribution in the cooking chamber.

A heating cooker comprises a housing 2 employing a reflector on the chamber wall (ceiling wall 12, side wall 13, rear wall) and having a cooking chamber provided with an opening 11 in the front, a heater 20 disposed in the cooking chamber, a mounting net 15 disposed under the heater 20, and a door 130 for opening/closing the opening 11 applied with a partially transparent window glass 133 wherein a heat shield plate 140 for covering the window glass 133 selectively is provided on the cooking chamber side of the door 133.