DETERIORATION DEGREE DETERMINATION DEVICE FOR SECONDARY BATTERY

A deterioration degree determination device (1) has a battery information acquisition unit (61), a feasibility determination unit (62), a battery characteristic acquisition unit (63), and a deterioration degree determination unit (65). The battery information acquisition unit (61) acquires battery information related to the secondary battery (21 to 26). The feasibility determination unit (62) determines feasibility of determination of the deterioration degree of each secondary battery (21 to 26) based on the battery information acquired by the battery information acquisition unit (61) and a feasibility determination reference prepared in advance. The battery characteristic acquisition unit (63) acquires a battery characteristic related to transition of a battery state in a predetermined voltage section for the secondary battery (21 to 26) for which determination of the deterioration degree is determined to be feasible by the feasibility determination unit (62). The deterioration degree determination unit (65) determines the deterioration degree of the secondary battery (21 to 26) for which the determination of the deterioration degree is determined to be feasible, based on the battery characteristic acquired by the battery characteristic acquisition unit (63) or a battery characteristic relationship value calculated based on the battery characteristic.