An electrothermal cooker including an upper opening, a heating case, a lid body for the upper opening, a lower heater for heating a lower portion of the heating chamber, an upper heater for heating an upper portion of the heating chamber, and a check window. The lid body includes an inner lid, beneath an outer lid, which form the upper portion of the heating chamber. The upper heater is mounted to the lid body. The outer lid and inner lid define an opening for the check window. A portion of the lower side edge of the outer lid forms an engaging portion under the check window, and an upper portion of the inner lid forms a contact support for an outer peripheral edge of the check window, engaged with the engaging portion while surrounding this outer peripheral edge portion from under.