To provide a camera system capable of easily and surely switching a plurality of photographing modes and acquiring an image corresponding to each mode.

A camera 1 has a posture detecting switch 121 (122) installed and put into an ON state when pressed by a switch pressing protrusion 332 (331) formed at a support shaft 3. The camera 1 is detachably installed by a holding member 2, and the holding member 2 and the camera 1 are turnably installed with respect to the support shaft 3. Since the contact between the posture detecting switch 121 (122) and the switch pressing protrusion 332 (331), i.e., the ON/OFF combination of the posture detecting switch 121 (122), differs according to each of a plurality of turning positions of the camera 1 and the detached state from the holding member 2, the camera 1 detects the combination to determine the posture of the local device, and makes an image correction in the photographing mode corresponding to the posture to output.