Cooking device

A heating cooking device comprising:

• a top plate having an upper surface and a lower surface, the upper surface being arranged to have an object to be heated placed thereon;
• a heating unit for heating the object;
• a touch key including a first electrode and a second electrode, the first electrode being provided on the upper surface of the top plate, the second electrode being provided on the lower surface of the top plate and facing the first electrode across the top plate;
• an input unit for applying an alternating current (AC) voltage to the second electrode, and for outputting a voltage changing from a reference value to a first value and consecutively changing towards the reference value according to a change of the AC voltage when the first electrode is pushed;
• a detector for outputting a first signal if the voltage output from the input unit changes from the reference value to the first value;
• an operation judging unit for outputting a second signal according to a rate of change of the voltage output from the input unit which changes towards the reference value consecutively after changing from the reference value to the first value;
• and
• a controller operable
• to perform control of energization of the heating unit if the controller does not receive the second signal after receiving the first signal, and
• not to perform the control of the energization of the heating unit if the controller receives the second signal after receiving the first signal.