Sensor Placement Determination Device and Sensor Placement Determination Method

This sensor placement determination device is provided with an external storage device (15) in which traffic data, i.e. the actual paths taken by people, is recorded in a planned target area in which sensors are to be arranged, a traffic simulation observation unit (100) which, for candidate arrangement positions of the sensors in the target area, generates, on the basis of the traffic data, information about the passage of people through the monitoring area of the sensors, a traffic estimation unit (102) which, with the passage information as a constraining condition, generates candidate paths by which people might pass through the target area, an estimated error calculation unit (104) which, for the traffic through the monitoring area of the sensors, calculates an estimated error between the number of people passing along the candidate paths and the number of people passing along the actual paths, and an additional camera determination unit (106) which determines a sensor arrangement position that minimizes the calculated estimated traffic error.