The griddle of this invention includes a temperature adjustment element for adjusting a cooking temperature for a material such as meat and vegetable, a thin plate having a small heat capacity for heating the material, an adiabatic frame for supporting the thin plate with an adiabatic structure, a plurality of heating elements for heating the thin plate, a plurality of temperature sensors for measuring temperatures of a plurality of positions on the thin plate, and a power distribution element for determining power to be distributed to each of the heating elements based on the outputs from the temperature sensors and the cooking temperature.