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PROBLEM TO BE SOLVED : To provide a rare earth-Mg-Ni hydrogen storing alloy having high hydrogen equilibrium pressure while keeping alkali resistance and hydrogen storing amount; and a hydrogen storing alloy electrode using the hydrogen storing alloy; and a nickel hydrogen secondary battery having high capacity, long cycle life, and high working voltage. SOLUTION : The nickel hydrogen secondary battery contains hydrogen storing alloy particles 36 in a negative electrode 26, and the hydrogen storing alloy has a composition represented by general formula : (NdaDybAc)1-wMgwNixAlyTz. In the formula, A and T each represent at least one element selected from the group comprising La, Pr and the like, and the group comprising V, Nb and the like; subscripts a, b, and c each satisfy the relation represented by a>0, b>0, c>0, a+b+c=1; subscripts w, x, and z each are in the range represented by 0

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