1. A cooking device comprising:a magnetron:
a heating chamber in which an object to be cooked is to be put;
a door section, provided so that the heating chamber is opened and closed, which has a window section and a nonmetal frame section, which surrounds the window section;
a display operation section configured to carry out display and accept an operation;
a steam generator configured to generate steam; and
a water reservoir, mainly made of a nonmetal, which is (i) a container configured to store water to be supplied to the steam generator and (ii) detachably provided from the cooking device,
a space for providing a radio communication device that establishes an external communication being secured in contact with the water reservoir.