1. A lane marking detection apparatus, comprising: an original image acquirement part configured to acquire an original image that is obtained by taking an image of a traveling road from a traveling object traveling on said traveling road; a lane marking position detection part configured to detect a relative position of a lane marking included in said traveling road to said traveling object, based on said original image; and an examination part configured to examine a detection result of said lane marking position detection part, based on a partial image extracted from a first image that is the original image obtained at time t 0 , and a partial image extracted from a past image that is the original image obtained before time t 0 .