1. A human being detection apparatus for detecting a human being in a plurality of picture images including a moving object shot by a plurality of cameras, comprising: a moving object detecting part that detects a target region of the moving object in the picture images and a target distance to the moving object from the camera as moving object information on the basis of parallaxes in picture images and a difference between picture images sequentially entered; a head region setting part that sets a head region as having a predetermined size corresponding to the target distance in the target region detected by the moving object detecting part when it is assumed that the moving object is the human being; a sample image storing part for storing a sample image having a predetermined size corresponding to the head region of the human being; and a human being determining part that determines whether the moving object is the human being by converting the head region, set by the head region setting part, in the picture image into an image having the predetermined size and comparing the converted head region with the sample image to determine that the moving object is the human being.