Alkaline storage battery

An alkaline storage battery, comprising:

• a positive electrode including a positive electrode mixture layer containing, as a positive electrode active material, a nickel compound having a surface at least partially coated with a cobalt compound;
• and
• a negative electrode including a negative electrode mixture layer containing a hydrogen storage alloy,
• wherein
• the positive electrode mixture layer includes two surface layers and an inner layer sandwiched between the two surface layers,
• each of the two surface layers and the inner layer contains the positive electrode active material,
• a thickness Ts of each of the two surface layers is 20 μm or more,
• a ratio Ts/Tp of the thickness Ts to a thickness Tp of the positive electrode mixture layer is in a range of 0.03 to 0.20,
• each of the two surface layers contains a titanium compound and a magnesium compound, the inner layer contains a compound of at least one element X selected from the group consisting of Ti, Yb, Y, Nb, and W,
• a ratio Mst/Msc of a mass Mst of titanium contained in each of the two surface layers to a mass Msc of cobalt contained in each of the two surface layers is in a range of 0.04 to 0.60,
• a ratio Msm/Msc of a mass Msm of magnesium contained in each of the two surface layers to the mass Msc is in a range of 0.01 to 0.30,
• a ratio Mix/Mic of a total mass Mix of the at least one element X contained in the inner layer to a mass Mic of cobalt contained in the inner layer is in a range of 0.04 to 0.60, and
• a ratio Mim/Mic of a mass Mim of magnesium contained in the inner layer to the mass Mic is 0.001 or less.