To provide a gas electrode reduced in performance degradation even in an alkali.

The gas electrode comprises as essential components, a polymer electrolyte, a catalyst, and carbon material, preferably cross-linker. The polymer electrolyte has an imidazolium residue represented by a formula (1). A use of the gas electrode provides air batteries and fuel cells reduced in performance degradation. In the formula (1), R1, R2, R3, R4, and R5 represent a hydrogen atom or a monovalent organic group, X- represents a counter anion.