A lens driving device capable of efficiently inhibiting garbage from falling to the side of a photosensitive sensor includes a lens support for retaining a lens, a fixed member, one or two spring members for connecting the lens support and the fixed member, and an electromagnetic driving assembly. The fixed member includes a substrate defining a circular through hole, a cylindrical dividing wall extending from an edge defining the circular through hole, several protruding parts protruding from the substrate outside the dividing wall, and concave parts formed between the protruding parts and the dividing wall. The lens support is provided with an end face capable of contacting a second front end face of the protruding parts and opposite to the concave parts, and a ring-shaped end surface arranged opposite to an end face of the dividing wall.