A lens driving apparatus comprising: a lens holder having a cylindrical portion adapted to hold a lens assembly; a driving coil fixed to the lens holder so as to be positioned in a circumference of the cylindrical portion; a yoke having a permanent magnet opposed to the driving coil; and a front spring and a rear spring provided on both sides of the cylindrical portion of the lens holder in an optical axis direction of the cylindrical portion and movably supporting the lens holder in the optical axis direction in a state where the lens holder is positioned in a radial direction of the cylindrical portion, wherein the lens driving apparatus has a quadratic shape in a plane perpendicular to the optical axis direction, wherein each of the front spring and the rear spring (22, 24) has an inner peripheral end (222, 242) attached to the lens holder and an outer peripheral end (224, 244) attached to the yoke; wherein an inner peripheral wall of the cylindrical portion is provided with a female screw so that an outer peripheral wall of the lens assembly, which is provided with a male screw can be threaded into the female screw; wherein the lens driving apparatus comprises a stopper which sandwiches the inner peripheral end of the front spring between the cylindrical portion of the lens holder and the stopper, wherein the stopper has a function of improving an adhering strength of the front spring, a function of preventing a deformation of the front spring when a drop impact occurs in the lens driving apparatus, and a function of determining a mechanical stroke of the lens driving apparatus; wherein the stopper comprises a rotation preventing member which completely prevents the lens holder from being rotated upon mounting the lens assembly to the cylindrical portion of the lens holder, in a screwed manner, wherein the rotation preventing member is protruded from the ring-shaped stopper outwardly in a radial direction of the ring-shaped stopper toward corner portions of the quadratic shape of the lens driving apparatus, wherein the rotation preventing member has two restraining portions provided at positions having rotational symmetries through 180 degrees with respect to an optical axis of the cylindrical portion, and wherein each of the restraining portions has a U-shape. a lens holder having a cylindrical portion adapted to hold a lens assembly; a driving coil fixed to the lens holder so as to be positioned in a circumference of the cylindrical portion; a yoke having a permanent magnet opposed to the driving coil; and a front spring and a rear spring provided on both sides of the cylindrical portion of the lens holder in an optical axis direction of the cylindrical portion and movably supporting the lens holder in the optical axis direction in a state where the lens holder is positioned in a radial direction of the cylindrical portion, wherein the lens driving apparatus has a quadratic shape in a plane perpendicular to the optical axis direction, wherein each of the front spring and the rear spring (22, 24) has an inner peripheral end (222, 242) attached to the lens holder and an outer peripheral end (224, 244) attached to the yoke; wherein an inner peripheral wall of the cylindrical portion is provided with a female screw so that an outer peripheral wall of the lens assembly, which is provided with a male screw can be threaded into the female screw; wherein the lens driving apparatus comprises a stopper which sandwiches the inner peripheral end of the front spring between the cylindrical portion of the lens holder and the stopper, wherein the stopper has a function of improving an adhering strength of the front spring, a function of preventing a deformation of the front spring when a drop impact occurs in the lens driving apparatus, and a function of determining a mechanical stroke of the lens driving apparatus; wherein the stopper comprises a rotation preventing member which completely prevents the lens holder from being rotated upon mounting the lens assembly to the cylindrical portion of the lens holder, in a screwed manner, wherein the rotation preventing member is protruded from the ring-shaped stopper outwardly in a radial direction of the ring-shaped stopper toward corner portions of the quadratic shape of the lens driving apparatus, wherein the rotation preventing member has two restraining portions provided at positions having rotational symmetries through 180 degrees with respect to an optical axis of the cylindrical portion, and wherein each of the restraining portions has a U-shape.