1. A camera apparatus comprising: a lens system for receiving the optical image of an object; a photoelectric conversion means for converting the optical image of said object which has passed through said lens system into electric signals; holding means for holding said lens system and said photoelectric conversion means; a cabinet for encasing therein said holding means, a front part of said holding means being exposed out of said cabinet so that said lens system can receive the optical image of the object; supporting means encased in said cabinet for rotatably supporting said holding means in at least one of panning and tilting directions with respect to said cabinet; drive means for driving said holding means to move said holding means in at least one of said panning and tilting directions; control means for controlling said drive means; and lock means operable independently of said drive means for locking said holding means so as to prevent movement of said holding means relative to said cabinet.