Abstract: In order to determine a monitoring circuit having a leak current equal to or more than a predetermined reference, the monitoring device 20 includes the determination unit 13 that determines whether a leak current of a specific monitoring circuit 11, among a plurality of monitoring circuits 11 that are driven using electric power stored in two or more battery units 10 associated as a monitoring target, is equal to or more than a first reference using: a comparison result of comparison between a proportion of the specific monitoring circuit 11 being associated with a low-voltage battery unit having the lowest voltage value among the plurality of battery units 10 and a predetermined threshold value; and information indicating whether or not the number of low-voltage battery units associated with the specific monitoring circuit 11 is 2 or more.

Abstract: In order to determine a monitoring circuit having a leak current equal to or more than a predetermined reference, the monitoring device 20 includes the determination unit 13 that determines whether a leak current of a specific monitoring circuit 11, among a plurality of monitoring circuits 11 that are driven using electric power stored in two or more battery units 10 associated as a monitoring target, is equal to or more than a first reference using: a comparison result of comparison between a proportion of the specific monitoring circuit 11 being associated with a low-voltage battery unit having the lowest voltage value among the plurality of battery units 10 and a predetermined threshold value; and information indicating whether or not the number of low-voltage battery units associated with the specific monitoring circuit 11 is 2 or more.