An object tracing device, an object tracing system and an object tracing method are disclosed, which traces a truly suspicious object even when a new suspicious object comes into an area to be monitored after a suspicious object has been started to be traced. In the object tracing device, an object-identifying part identifies a plurality of objects in a wide-angle picture taken by a first picture-taking device; a chronological-information-creating part creates chronological information of the identified objects; an object-selecting part selects an object having a selecting condition identical with that of the object defined as the object to be traced; and a control part drives a second picture-taking device taking a picture of a narrower angle than a first picture-taking device does and controls the picture-taking device in taking a picture of the selected object.