Patent ID: 7829220

Claim:
A hydrogen storage alloy for an alkaline battery which is used as a negative electrode active material of an alkaline battery, comprising: an element R selected from the Group IV and the rare earth elements including Y and excluding La; and an element M consisting of at least one of Co, Mn, and Zn; wherein the hydrogen storage alloy is represented by general formula: La α R 1−α−β Mg β Ni γ−η−ε Al η M ε (wherein α, β, γ, η, ε satisfy numerical formula: 0≦α≦0.5, 0.1≦β≦0.2, 3.7≦γ3.9, 0.1≦η≦0.3, 0≦ε≦0.2); and the constituent ratio of the A 5 B 19 -type structure is 40% or more in the crystal structure thereof.