DEVICE FOR ASSESSING DEGREE OF DEGRADATION OF SECONDARY BATTERY AND ASSEMBLED BATTERY

A degradation degree assessment device for a secondary battery (1) is to assess a degree of degradation of a secondary battery (2) and includes a battery characteristic acquisition unit (61), a capacity estimation unit (62), and an assessment unit (63). The battery characteristic acquisition unit (61) acquires a battery characteristic relating to a voltage transition of the secondary battery (2) in a predetermined voltage section. The assessment unit (63) assesses the degree of degradation of the secondary battery (2) based on the battery characteristic acquired by the battery characteristic acquisition unit (61) or based on a battery characteristic-related value computed on the basis of the battery characteristic.