A person tracking method capable of tracking movements of a person captured by a camera through lighter processing in comparison with tracking processing that employs a Kalman filter or the like is provided. The method includes: detecting a head on each frame image; calculating a feature quantity that features a person whose head is detected on the frame images; calculating a relevance ratio that represents a degree of agreement between a feature quantity on a past frame image and a feature quantity on a current frame image, which belong to each person whose head is detected on the current frame image; and determining that, a head, which is a basis for calculation of a relevance ratio that represents a degree of agreement being a first threshold as well as being a maximum degree of agreement, is a head of the same person as the person having the head.