Alkaline storage battery

An alkaline storage battery having excellent self-discharge characteristics even after a number of charge-discharge cycles is provided. The alkaline storage battery is provided with a case 11 and an electrode group 12 enclosed in the case 11, and a separator that is included in the electrode group 12 retains at least 15 mg/cm 2 of an electrolyte at least in a period after assembling the battery, from the time the separator is impregnated with the electrolyte to the time the battery is activated.