Deterioration state prediction method, deterioration state prediction device, and deterioration state prediction program

The purpose of the present invention is to predict the deterioration state of a secondary battery with high accuracy. A deterioration state prediction method for calculating a cause-differentiated deterioration state (25) for each deterioration cause, and predicting a deterioration state (26) of a secondary battery (1) on the basis of a plurality of cause-differentiated deterioration states (25), each cause-differentiated deterioration state (25) is based on a prior cause-differentiated deterioration state (21), which is a cause-differentiated deterioration state (25) that precedes an arbitrary amount of first time, and a unit cause-differentiated deterioration state in which deterioration occurs during the period of the first time. Time dependencies that differ according to the cause of degradation and comply with a power law that distinguishes the elapsed time of the degradation state (25) from the cause, and degradation speeds that differ according to the cause of degradation and are determined according t