Electronic apparatuses and a camera assembly are provided. An electronic apparatus comprises a housing, a display screen, a camera assembly, and a sensor assembly. The display screen is installed at the housing. A first through hole is defined at the display screen. The camera assembly is disposed correspondingly to the first through hole. A step portion forms on the camera assembly, and the step portion comprises a surface facing towards the display screen. The sensor assembly is mounted on the surface of the step portion.