A VCM (Voice Coil Motor) comprising a rotor moving along a linear axis, comprising, when said linear axis is oriented vertically: a yoke comprising an upper plate formed with an opening for exposing a lens and a lateral plate extending from the upper plate to a direction parallel with a lateral surface of a housing; the housing disposed in the yoke, the housing formed in a shape of a rectangular parallelepiped opened at an upper surface and at a bottom surface, having inner lateral surfaces in parallel with an outer circumferential surface of a bobbin and formed with a magnet accommodation hole; a rotor including the bobbin, the bobbin disposed in the housing and being formed in a shape of a cylinder having a through hole and coupled at an inner surface thereof to the lens; a base disposed below the housing and coupled with the lateral plate of the yoke, the base serving to fix the rotor and formed with an opening to allow a light to pass through the lens; a coil block in a shape of a cylinder and arranged at a periphery of the bobbin; a stator including a plurality of magnets disposed on the housing and facing the coil block; and a first elastic member fixed at the housing and coupled to the bobbin to elastically support the bobbin, wherein the first elastic member comprises an inner elastic part coupled to the bobbin, an outer elastic part fixedly disposed between a lower surface of the housing and an upper surface of the base, and a connection elastic part connecting the inner elastic part and the outer elastic part, the base comprises a first foreign object prevention unit in the shape of a wall protruding from an outer edge of the upper surface of the base, the housing comprises a second foreign object prevention unit recessed from an outer edge of the lower surface of the housing, the first foreign object prevention unit of the base is disposed on the second foreign object prevention unit of the housing so that the first foreign object prevention unit, a portion of the housing forming the second foreign object prevention unit and the lateral plate of the yoke are overlapped in a horizontal direction, characterized in that the base comprises a coupling pillar more protruding than the first foreign object prevention unit from a corner area of the upper surface of the base, the housing comprises a coupling groove formed at a corner of the housing and coupled with the coupling pillar of the base, the first foreign object prevention unit is connected to the coupling pillar, and an upper surface of the first foreign object prevention unit is completely overlapped with the magnet in the direction of the optical axis of the VCM in a cross-sectional view. a yoke comprising an upper plate formed with an opening for exposing a lens and a lateral plate extending from the upper plate to a direction parallel with a lateral surface of a housing; the housing disposed in the yoke, the housing formed in a shape of a rectangular parallelepiped opened at an upper surface and at a bottom surface, having inner lateral surfaces in parallel with an outer circumferential surface of a bobbin and formed with a magnet accommodation hole; a rotor including the bobbin, the bobbin disposed in the housing and being formed in a shape of a cylinder having a through hole and coupled at an inner surface thereof to the lens; a base disposed below the housing and coupled with the lateral plate of the yoke, the base serving to fix the rotor and formed with an opening to allow a light to pass through the lens; a coil block in a shape of a cylinder and arranged at a periphery of the bobbin; a stator including a plurality of magnets disposed on the housing and facing the coil block; and a first elastic member fixed at the housing and coupled to the bobbin to elastically support the bobbin, wherein the first elastic member comprises an inner elastic part coupled to the bobbin, an outer elastic part fixedly disposed between a lower surface of the housing and an upper surface of the base, and a connection elastic part connecting the inner elastic part and the outer elastic part, the base comprises a first foreign object prevention unit in the shape of a wall protruding from an outer edge of the upper surface of the base, the housing comprises a second foreign object prevention unit recessed from an outer edge of the lower surface of the housing, the first foreign object prevention unit of the base is disposed on the second foreign object prevention unit of the housing so that the first foreign object prevention unit, a portion of the housing forming the second foreign object prevention unit and the lateral plate of the yoke are overlapped in a horizontal direction, characterized in that the base comprises a coupling pillar more protruding than the first foreign object prevention unit from a corner area of the upper surface of the base, the housing comprises a coupling groove formed at a corner of the housing and coupled with the coupling pillar of the base, the first foreign object prevention unit is connected to the coupling pillar, and an upper surface of the first foreign object prevention unit is completely overlapped with the magnet in the direction of the optical axis of the VCM in a cross-sectional view.