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.degree., 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.