To restrain an increase in power consumption in a cooker capable of changing sealing performance in a container by electric control.SOLUTION: A cooker comprises a container, heating means for heating the container, a lid body for covering the container, a self-holding type first valve for changing sealing performance of an internal space of the container, and a control device for controlling the first valve. When supply of commercial power is stopped, the control device switches the first valve so that the internal space of the container and the outside of the container communicate with each other.SELECTED DRAWING: Figure 7

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