A refrigerator and an oxygen reduction apparatus are disclosed. The temperature inside the refrigerator does not rise even if the oxygen reduction apparatus that uses a polymer electrolyte membrane method is disposed in a box of the refrigerator. According to an embodiment, the refrigerator has an oxygen reduction chamber and an oxygen reduction apparatus which reduces the oxygen in the oxygen reduction chamber. The oxygen reduction apparatus is provided inside a thermally insulated housing with: a polymer electrolyte membrane, an anode layer disposed on one side of the polymer electrolyte membrane, a cathode layer disposed on the other side of the polymer electrolyte membrane and is communication with the oxygen reduction chamber, a first current collector which electrifies the anode layer, a second current collector which electrifies the cathode layer, and a water supply body which is disposed on the anode layer side.