This is a report on an autopsy case that revealed a gunshot wound to the back of the head. On examination of the external surface, an entrance and exit wound could not be found in the head region because of the severe post-mortem changes and the atypical entrance wound position and direction of the bullet tract; X-rays taken before the internal examination were effective in this case. In this case, the direction of the bullet tract was supposed to be similar to that of the suboccipital puncture.