A camera module (200) includes a lens module and a base (210) with a sensor installed thereon. The base is provided with at least two supporting protrusions (222) extending therefrom. Each protrusion is oriented the lens module, and the lens module is fixedly to and contacts with the at least two supporting protrusions. A colloid layer surrounding the sensor is sandwiched between the second end of the holder and the base. Electronic components are disposed on the circuit board and covered by the colloid layer.