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The nickel hydrogen secondary battery (2) has an electrode group (22) including a separator (28), a positive electrode (24) and a negative electrode (26), wherein the negative electrode (26) has a negative electrode core, and a negative electrode mixture held on the negative electrode core, wherein the negative electrode mixture contains a hydrogen absorbing alloy and a water repellent, wherein the hydrogen absorbing alloy has a composition represented by the general formula : Ln1-xMgxNiy-a-bAlaMb (wherein Ln represents at least one element selected from rare earth elements, Ti and Zr; M represents at least one element selected from V, Nb, Ta, and the like; and the subscripts a, b, x and y satisfy relations represented by 0.05 ≤ a ≤ 0.30, 0 ≤ b ≤ 0.50, 0 ≤ x < 0.05 and 2.8 ≤ y ≤ 3.9, respectively), and has a structure of an A2B7 type; and the water repellent comprises a perfluoroalkoxyalkane.