Disclosed is a camera system equipped with a pair of photographing systems and a drive mechanism. Each of the pair of photographing systems of the camera system is equipped with an image pickup element and a zoom lens for forming an object image on the image pickup element. The entrance pupil position of this zoom lens with respect to the image pickup element varies according to zooming. When zooming is performed, the drive mechanism moves the zoom lenses and the image pickup elements integrally in a direction opposite to a direction in which the entrance pupil positions of the zoom lenses move with respect to the image pickup elements. Further, each of the pair of photographing systems is configured to be rotatable around the entrance pupil centers of the respective zoom lenses of the photographing systems.