[Problem]
To provide a suspicious or abnormal subject detecting device for detecting a suspicious or abnormal subject appeared in time-series images.
[Solution]
An accumulating device 2 includes a first detecting unit 23 for detecting movement of a plurality of articulations includes in an action subject Z appeared in a plurality of first time-series images Y1 obtained by photographing a predetermined point; and a determining unit 24 for determining one or more of normal actions at the predetermined point based on a large number of movement of the plurality of articulations detected by the first detecting unit 23. The detecting device 3 includes a second detecting unit 33 for detecting movement of a plurality of articulations includes in an action subject Z appeared in a plurality of second time-series images Y2 obtained by photographing the predetermined point; and an extracting unit 34 for extracting, when the movement of a plurality of articulations detected by the second detecting unit 33 is different from the normal action determined by the determining unit 24, the action subject Z which has performed the action different from the normal action from among the plurality of second time-series images Y2.