Heating device and refrigerator equipped with heating device

A heating device comprising:

• a heating chamber having a heating space that contains an object to be heated;
• an oscillation electrode disposed on a first side of the heating space and comprising an electrode plate on which an electric field concentration region is formed;
• a counter electrode disposed on a second side the other hand of the heating space opposed to the first side and comprising an electrode plate that faces the electrode plate of the oscillation electrode;
• a high-frequency electric field forming unit for forming a high-frequency electric field applied between the electrode plate of the oscillation electrode and the electrode plate of the counter electrode;
• an inner surface member that covers a first surface of the electrode plate of the oscillation electrode, the first surface facing to the heating chamber;
• and
• an air passage through which cold air passes, the air passage being disposed on a second surface of the electrode plate of the oscillation electrode, the second surface being an opposite surface from the first surface;
• wherein
• the oscillation electrode includes an opening portion formed in the electrode plate of the oscillation electrode and extending from the first surface to the second surface of the electrode plate of the oscillation electrode,
• the inner surface member includes a cold air introduction hole, and
• the location of the opening portion of the electrode plate of the oscillation electrode corresponds to the location of the cold air introduction hole of the inner surface member so that the cold air is introduced from the air passage to the heating chamber through the opening portion and the cold air introduction hole.