A lens holder for receiving a lens barrel includes a base portion and a barrel portion. The base portion defines a first circular chamber and a second chamber communicating with the first chamber. The first chamber has a diameter equal to an outer diameter of the lens barrel. The second chamber receives an image sensor. The barrel portion extends coaxially from the base portion. The sidewall of the barrel portion defines a number of through slots extending along a direction parallel to the central axis of the barrel portion.