To provide a solid oxide fuel cell (SOFC) in which a decrease in output due to an increase in electric resistance between an air electrode and a solid electrolyte membrane hardly occurs even after long-term use.

The SOFC includes: a fuel electrode 110 for allowing fuel gas to react; an air electrode 140 for allowing oxygen-containing gas to react; an electrolyte membrane 120 provided between the fuel electrode 110 and the air electrode 140; and a reaction prevention film 130 provided between the air electrode 140 and the electrolyte membrane 120. The reaction prevention film 130 has a porosity of less than 10%, and preferably a closed pore-ratio of 50% or more. Closed pores in the reaction prevention film 130 have a diameter of 0.1-3 μm. A component (Sr or the like) constituting the air electrode 140 is contained inside the closed pores in the reaction prevention film 130.