A camera module includes a lens and a lens holder. The lens has a connecting barrel. The lens holder includes a base plate, a number of claws extending up from the base plate and sleeving on the connecting barrel, a fixing block extending up from the base plate and defining a fixing hole, a tightening ring sleeving on the claws and having two end sections sandwiching the fixing block. The tightening ring also includes a tightening screw for threadedly passing the threaded holes to tightening the tightening ring such that the claws deforms and grasps the connecting barrel.