The hydrogen storage alloy

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PROBLEM TO BE SOLVED : To provide a novel CaCu5 type hydrogen storage alloy containing Mm, in which the contents of Nd and Pr in the Mm can be decreased while life characteristics thereof can be maintained.SOLUTION : The CaCu5 type hydrogen storage alloy is a hydrogen storage alloy having a parent phase of an AB5-type crystal structure. In the hydrogen storage alloy, the A site of the AB5 type comprises Mm in which La and Ce occupy 90-100 mass% of the entire misch metal (referred to as Mm), and the B site of the AB5 type comprises any one of Ni, Al, Mn, Co, Fe, Ti, V, Zr, or a combination of two or more thereof. The crystallite size (by the Lorentzian method) obtained by X-ray diffraction measurement of the hydrogen storage alloy is larger than 466 nm, and the strain (by the Lorentzian method) is 0.18 or lower.