Alkaline

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PROBLEM TO BE SOLVED : To provide an alkaline storage battery which is superior in a storage property at a high temperature by applying at least one kind of surface treatment on a rare earth based hydrogen storage alloy, which contain as constituent elements, misch metal containing at least of 60 to 90 wt.% of La, Ni, Co and Mn, and Mg in the range of 0.015 to 0.1 in atomic ratio to misch metal, using this as a negative active material. SOLUTION : By applying at least one kind of surface treatment of surface treatment to a rare earth based hydrogen storage alloy, which contain as constituted elements, misch metal containing at least 60 to 90 wt.% of La, Ni, Co and Mn, and Mg in the range of 0.015 to 0.1 in atomic ratio to misch metal, and using this for the negative electrode as the negative active material, to constituted an alkaline storage battery.