A camera installation device has a camera installation base (12) and a camera support section (14). A coupling direction (X) between the camera support section (14) and the camera installation base (12) is inclined relative to the direction vertical to a camera installation surface (16). Further, in the camera installation device, the angle of the camera support section (14) relative to the camera installation base (12) on a coupling reference surface (Y) crossing a coupling direction (X) is variable depending on the angle of the installation surface (16). Preferably, an inclination angle in the coupling direction (X) is 45°, and the camera support section (14) is reversible on the coupling reference surface (Y). Further, the camera support section (14) can be installed on an upper side and a lower side of a camera (18). The camera installation device can be used in different installation places such as a wall surface and a ceiling.