Method and apparatus for producing carbon monoxide

Disclosed is a method for producing carbon monoxide, which is characterized in that a carbon dioxide gas and a metal oxide that has oxygen ion conductivity and reversible oxygen deficiency are brought into contact with each other, while being heated, so that carbon dioxide is reduced by a stoichiometric reaction, thereby generating carbon monoxide. The metal oxide is preferably composed of cerium oxide that has reversible oxygen deficiency. The metal oxide oxidized by the contact with the carbon dioxide gas is preferably regenerated by being brought into contact with a reducing gas.