A lens module includes an image lens module and a voice coil motor (VCM) supported on the image lens module. The image lens module includes a seat and a spring element. The seat includes a top surface and a bottom surface opposite to the top surface and defines a notch on the top surface. The spring element is received in the notch, and part of the spring element protruding out of the notch. The VCM includes a lower plate supported on the top surface and the part of the spring element protruding out of the notch. Optical axes of the image lens module and the VCM are aligned with each other by pressing the spring element.