A capacity of the negative electrode includes a discharge reserve that is a capacity exceeding a capacity of the positive electrode. The hydrogen absorbing alloys of the negative electrode include a first hydrogen absorbing alloy and a second hydrogen absorbing alloy having a hydrogen equilibrium dissociation pressure than the first hydrogen absorbing alloy. An element, among the elements contained in the hydrogen absorbing alloy, having high affinity for hydrogen is set as element A, and the element having lower affinity for hydrogen is set as element B, and a ratio of a substance amount of the element B to a substance amount of the element A is referred to as an AB ratio, the AB ratio of the second hydrogen absorbing alloy is greater than an AB ratio of the first hydrogen absorbing alloy. A proportion of the first hydrogen absorbing alloy in all of the hydrogen absorbing alloys is less than a sum of a proportion of the discharge reserve in the entire capacity of the negative electrode and a proportion of a capacity of a portion corresponding to a lower limit value of 0% or greater of a charge rate of the positive electrode in the negative electrode in the entire capacity of the negative electrode.