A lens driving device comprising: an auto focus movable part including an lens holder configured to hold a lens barrel and an auto-focusing coil part disposed on the lens holder; an auto focus fixing part including an auto-focusing magnet part and a magnet holder, the magnet holder having a frame shape and configured to hold the auto-focusing magnet part, the auto-focusing magnet part being disposed separately from the auto-focusing coil part outward in a radial direction orthogonal to a light axis direction; an upper elastic supporting member configured to elastically connect an upper portion of the lens holder and an upper portion of the magnet holder; and a lower elastic supporting member configured to elastically connect a lower portion of the lens holder and a lower portion of the magnet holder, wherein the lens driving device is configured to perform automatic focusing by moving the auto focus movable part with respect to the auto focus fixing part in the light axis direction by use of a driving force of a voice coil motor composed of the auto-focusing coil part and the auto-focusing magnet part, and wherein the lens holder includes at an upper portion thereof a magnet locking part protruding outward in a radial direction over the auto-focusing coil part, and the auto focus movable part is fixed to the auto focus fixing part in a state, where the auto focus movable part is pushed up to the light reception side in the light axis direction and biased to the imaging side in the light axis direction by the upper elastic supporting member and the lower elastic supporting member, by the auto-focusing magnet part being fixed to a predetermined position of the magnet holder in a state where a surface of the auto-focusing magnet part on the light reception side in the light axis direction makes contact with a surface of the magnet locking part on the imaging side in the light axis direction. an auto focus movable part including an lens holder configured to hold a lens barrel and an auto-focusing coil part disposed on the lens holder; an auto focus fixing part including an auto-focusing magnet part and a magnet holder, the magnet holder having a frame shape and configured to hold the auto-focusing magnet part, the auto-focusing magnet part being disposed separately from the auto-focusing coil part outward in a radial direction orthogonal to a light axis direction; an upper elastic supporting member configured to elastically connect an upper portion of the lens holder and an upper portion of the magnet holder; and a lower elastic supporting member configured to elastically connect a lower portion of the lens holder and a lower portion of the magnet holder, wherein the lens driving device is configured to perform automatic focusing by moving the auto focus movable part with respect to the auto focus fixing part in the light axis direction by use of a driving force of a voice coil motor composed of the auto-focusing coil part and the auto-focusing magnet part, and wherein the lens holder includes at an upper portion thereof a magnet locking part protruding outward in a radial direction over the auto-focusing coil part, and the auto focus movable part is fixed to the auto focus fixing part in a state, where the auto focus movable part is pushed up to the light reception side in the light axis direction and biased to the imaging side in the light axis direction by the upper elastic supporting member and the lower elastic supporting member, by the auto-focusing magnet part being fixed to a predetermined position of the magnet holder in a state where a surface of the auto-focusing magnet part on the light reception side in the light axis direction makes contact with a surface of the magnet locking part on the imaging side in the light axis direction.