A lens module includes a barrel defining a through hole, at least one plastic lens accommodated in the through hole and a UV/IR cut filter mounted on the barrel and configured for preventing entry of both UV light and IR light into the barrel. The lens module has a UV/IR cut filter mounted on the barrel configured for preventing entry of both UV light and IR light into the barrel, so it can prevent UV light damaging plastic lenses, and accordingly can improve the useful life of the lens module.