To provide an alkaline storage battery exhibiting superior battery capacity recovery characteristics even when over-discharge occurs, and exhibiting superior storage characteristics during charging. An alkaline storage battery is provided with: a positive electrode having active material particles of which nickel hydroxide is the main component; a negative electrode; and an electrolyte solution. The positive electrode active material particles have: a core layer containing nickel hydroxide; and a conductive auxiliary layer coating the surface of the core layer. The conductive auxiliary layer contains a cobalt oxyhydroxide phase and a cerium dioxide phase. A sodium hydroxide aqueous solution is the main component of the electrolyte solution.