Nickel hydrogen rechargeable battery

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A nickel hydrogen rechargeable battery has a positive electrode and a negative electrode. The positive electrode includes positive-electrode active material made of nickel hydroxide particles in which magnesium is dissolved, and the negative electrode includes rare earth-Mg—Ni-based hydrogen storage alloy powder. At least either one of the negative and positive electrodes includes as additive at least one selected from a group including zinc and zinc compounds. The content of the additive ranges from 0.2 to 1.5 part by weight per 100 parts by weight of hydrogen storage alloy in the negative electrode, and ranges from 0.3 to 1.5 part by weight per 100 parts by weight of positive-electrode active material in the positive electrode.