An imaging system is provided which can efficiently capture an authentication image of a subject by an imaging device provided around a position toward which the subject is moving. The imaging system includes; a plurality of imaging devices, provided at different positions, respectively, for capturing moving images; a direction detection unit for detecting the moving direction of the subject based on the moving image in which the subject is contained; a selection unit for selecting one of the imaging devices, that is to capture the authentication image of the subject based on the moving direction thus detected and the positions of the imaging devices; and a storage unit for storing the authentication image captured by the selected imaging device.