A camera module includes a lens module, an image sensor, and a circuit board. The image sensor module is disposed in an image side of the lens module. The circuit board is electronically connected with the image sensor module. The circuit board includes a receiving chamber defined therein. The receiving chamber receives the image sensor module. The lens module is mounted on the circuit board and covers the receiving chamber. The image sensor module is fixed in the receiving chamber that is defined in the circuit board therein. Therefore, a thickness of the camera module along the axis of the camera module is decreased and a volume of the camera module becomes thinner compare with the conventional camera module.