In the imaging apparatus of the invention, a camera assembly 200 including a camera 202 is mounted on and supported by a base 110 in a pivotally rotatable manner in a vertical direction to allow tilting motions of the camera 202. First through fourth rollers 141 through 144 provided in an assembly fixation structure 114 of the base 110 support the camera assembly 200 to allow pivotal rotation of the camera assembly 200. The driving force of a tilting motor 160 built in a pedestal plate unit 130 of the assembly fixation structure 114 is transmitted to frame side faces of the camera assembly 200 via a tilting worm gear shaft 170 and a tilting rotation gear 172 to allow the tilting motions of the camera frame 200. This arrangement of the invention enables further downsizing of the whole imaging apparatus applied to, for example, a security camera.