A passenger counter that counts the number of persons who get on/off a vehicle comprising an imaging unit 2 installed at an inside of a vehicle platform; a setting unit 31 configured to set an inner area I corresponding to a passage inside the vehicle, one outer areas B surrounding the inner area I and inside the vehicle and other outer area A surrounding the inner area I and outside the vehicle; and a count determination unit 35 configured to count the number of persons who move from one outer area A(B) to the other outer area B(A) through the inner area I while a door of the platform is opened, not to count the number of persons while the door is closed, and to perform processing of determining a person existing in the inner area I when the opened (closed) door is closed (opened) to be counted.