Actuator and camera module thereof

The invention discloses a camera module. The camera module comprises an optical lens, a photosensitive component and a chip actuator, wherein the chip actuator comprises a driving assembly, a plurality of rolling electric connecting pieces and a circuit board, the driving assembly is located above the photosensitive assembly to drive the photosensitive assembly to move relative to the circuit board, and the rolling electric connecting pieces are located between the circuit board and the photosensitive assembly to support the photosensitive assembly. The photosensitive assembly is electrically connected with the circuit board through the rolling electric connecting piece. According to the technical scheme, the photosensitive component and the circuit board are directly conducted through the rolling electric connecting piece, so that the conduction efficiency is greatly improved, and the conductive performance in the module can be measured under the condition that the module is not electrified, thereby improvin