Lens driving apparatus, and camera module and optical device comprising same

A lens moving apparatus comprising:

• a board;
• a housing comprising a first side portion and a second side portion opposite each other and a third side portion and a fourth side portion opposite each other;
• a bobbin disposed in the housing;
• a first coil disposed on the bobbin;
• a magnet disposed on the housing;
• a sensing magnet disposed on the bobbin;
• a first position sensor disposed on the housing and opposite to the sensing magnet;
• an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing;
• a supporting member coupled to the upper elastic member;
• a base disposed under the board;
• and a second position sensor disposed between the board and the base and opposite to the magnet, wherein the board comprises a second coil opposite to the magnet and configured to move the housing by an interaction with the magnet, wherein the magnet comprises a first magnet disposed on the first side portion of the housing, a second magnet disposed on the second side portion of the housing, and a third magnet disposed on the third side portion of the housing, wherein the second coil comprises a first coil unit opposite the first magnet, a second coil unit opposite the second magnet, and a third coil unit opposite the third magnet, wherein the first coil comprises a fourth coil unit opposite to the first magnet and a fifth coil unit opposite to the second magnet, and wherein a number of windings of the third coil unit is greater than a number of windings of the first coil unit.