Lens driving device, camera module, and camera mounting device

A lens driving device comprising:

• an auto-focusing driving part,
• a Hall device,
• a first position detection magnet, and
• a second position detection magnet,
• the auto-focusing driving part including:
• an auto-focusing coil part disposed at a periphery of a lens part;
• and
• an auto-focusing magnet part composed of four permanent magnets and disposed separately from the auto-focusing coil part in a radial direction, the four permanent magnets being magnetized in a short direction and disposed in a square frame shape;
• the auto-focusing driving part being configured to perform automatic focusing by moving an auto focus movable part including the auto-focusing coil part in a light axis direction with respect to an auto focus fixing part including the auto-focusing magnet part by utilizing a driving force of a voice coil motor composed of the auto-focusing coil part and the auto-focusing magnet part;
• the Hall device being disposed separately from the auto-focusing magnet part in the light axis direction at a positon corresponding to one diagonal part of the auto-focusing magnet part such that a detection direction coincides with the light axis direction;
• the first position detection magnet being disposed in proximity to the Hall device such that a magnetization direction coincides with the light axis direction;
• the second position detection magnet having a configuration similar to that of the first position detection magnet, and being disposed at a position point symmetrical with the first position detection magnet about the light axis direction.