Abstract: A metal-oxygen cell capable of improving cycle performance is provided. The metal-oxygen cell 1 includes a positive electrode 2 that contains an oxygen storage material and uses oxygen as an active material, a negative electrode 3 that uses a metal as an active material, and an electrolyte layer 4 sandwiched between the positive electrode 2 and the negative electrode 3 and containing an electrolyte solution, effecting cell reactions of the positive electrode 2 on a surface of the oxygen storage material. The positive electrode 2 contains a conductive polymer that is capable of suppressing permeation of oxygen and conducting metal ions and covers at least a part of the surface of the oxygen storage material.