A secondary battery control device for an electrical vehicle comprising: a degree of deterioration calculation unit configured to calculate the degree of deterioration of a secondary battery for each of a plurality of member factors of the secondary battery ; a determination unit configured to determine a deteriorated member factor, of the plurality of member factors of the secondary battery , on the basis of a calculation result of the degree of deterioration calculation unit ; and a control unit configured to change an operation condition of the secondary battery according to the deteriorated member factor, characterized in that : the plurality of member factors are at least a positive electrode use rate, a negative electrode use rate and a negative electrode capacity deviation, and the positive electrode use rate is a use rate of the positive electrode active material amount, the negative electrode use rate is a use rate of the negative electrode active material amount, and the negative electrode capacity deviation is an index of the positional relationship between the charge and discharge curves of the positive electrode and the negative electrode; and in a case where the deteriorated member factor is the positive electrode use rate, the control unit is configured to change the operation condition of the secondary battery by lowering an upper limit current value and operate the secondary battery . a degree of deterioration calculation unit configured to calculate the degree of deterioration of a secondary battery for each of a plurality of member factors of the secondary battery ; a determination unit configured to determine a deteriorated member factor, of the plurality of member factors of the secondary battery , on the basis of a calculation result of the degree of deterioration calculation unit ; and a control unit configured to change an operation condition of the secondary battery according to the deteriorated member factor, characterized in that : the plurality of member factors are at least a positive electrode use rate, a negative electrode use rate and a negative electrode capacity deviation, and the positive electrode use rate is a use rate of the positive electrode active material amount, the negative electrode use rate is a use rate of the negative electrode active material amount, and the negative electrode capacity deviation is an index of the positional relationship between the charge and discharge curves of the positive electrode and the negative electrode; and in a case where the deteriorated member factor is the positive electrode use rate, the control unit is configured to change the operation condition of the secondary battery by lowering an upper limit current value and operate the secondary battery . the plurality of member factors are at least a positive electrode use rate, a negative electrode use rate and a negative electrode capacity deviation, and the positive electrode use rate is a use rate of the positive electrode active material amount, the negative electrode use rate is a use rate of the negative electrode active material amount, and the negative electrode capacity deviation is an index of the positional relationship between the charge and discharge curves of the positive electrode and the negative electrode; and in a case where the deteriorated member factor is the positive electrode use rate, the control unit is configured to change the operation condition of the secondary battery by lowering an upper limit current value and operate the secondary battery . <EOS>