Abstract: A passing person counting apparatus, installed at a path (passageway) having a width allowing one person to pass through, for counting the number of persons who pass there in a various different mode or posture, automatically and exactly. It is provided with a trunk portion sensing section with at least a pair of photo-switches, installed at a height of the trunk portion of a human body with an inter-distance slightly narrower than the thickness of the trunk portion, and a leg portion sensing section with at least a pair of photo-switches, installed beneath the former and very closely to each other.