A camera actuator comprising: a housing; a mover on which an optical member is disposed and which is disposed in the housing; a ball part including a first ball and a second ball disposed between the housing and the mover; and a driving unit disposed in the housing and configured to drive the mover, wherein: the mover includes a first protrusion extending toward the housing and including a recess; and the recess includes a side surface, on which the ball part is disposed and by which at least a portion of the recess is spaced apart from the ball part, and a bottom surface in contact with the side surface, wherein a plurality of the first protrusions are disposed on different surfaces, wherein the driving unit is configured to rotate the mover in a first direction or a second direction perpendicular to the first direction, the mover includes a first mover outer surface, a second mover outer surface facing the first mover outer surface, and a third mover outer surface disposed between the first mover outer surface and the second mover outer surface; and the driving unit includes a driving magnet and a driving coil; the driving magnet includes a first magnet, a second magnet, and a third magnet; the driving coil includes a first coil, a second coil, and a third coil; the first magnet and the second magnet are disposed symmetrically with each other on the basis of the first direction on the mover; the first coil and the second coil are disposed symmetrically with each other on the basis of the first direction between the housing and the mover; the third magnet is disposed between the first magnet and the second magnet; and the third coil is disposed between the first coil and the second coil, characterized in that the first protrusion includes a first-first protrusion disposed on the first mover outer surface, a first-second protrusion disposed on the second mover outer surface, and a first-third protrusion disposed on the third mover outer surface. a housing; a mover on which an optical member is disposed and which is disposed in the housing; a ball part including a first ball and a second ball disposed between the housing and the mover; and a driving unit disposed in the housing and configured to drive the mover, wherein: the mover includes a first protrusion extending toward the housing and including a recess; and the recess includes a side surface, on which the ball part is disposed and by which at least a portion of the recess is spaced apart from the ball part, and a bottom surface in contact with the side surface, wherein a plurality of the first protrusions are disposed on different surfaces, wherein the driving unit is configured to rotate the mover in a first direction or a second direction perpendicular to the first direction, the mover includes a first mover outer surface, a second mover outer surface facing the first mover outer surface, and a third mover outer surface disposed between the first mover outer surface and the second mover outer surface; and the driving unit includes a driving magnet and a driving coil; the driving magnet includes a first magnet, a second magnet, and a third magnet; the driving coil includes a first coil, a second coil, and a third coil; the first magnet and the second magnet are disposed symmetrically with each other on the basis of the first direction on the mover; the first coil and the second coil are disposed symmetrically with each other on the basis of the first direction between the housing and the mover; the third magnet is disposed between the first magnet and the second magnet; and the third coil is disposed between the first coil and the second coil, characterized in that the first protrusion includes a first-first protrusion disposed on the first mover outer surface, a first-second protrusion disposed on the second mover outer surface, and a first-third protrusion disposed on the third mover outer surface. the mover includes a first protrusion extending toward the housing and including a recess; and the recess includes a side surface, on which the ball part is disposed and by which at least a portion of the recess is spaced apart from the ball part, and a bottom surface in contact with the side surface, wherein a plurality of the first protrusions are disposed on different surfaces, wherein the driving unit is configured to rotate the mover in a first direction or a second direction perpendicular to the first direction, the mover includes a first mover outer surface, a second mover outer surface facing the first mover outer surface, and a third mover outer surface disposed between the first mover outer surface and the second mover outer surface; and the driving unit includes a driving magnet and a driving coil; the driving magnet includes a first magnet, a second magnet, and a third magnet; the driving coil includes a first coil, a second coil, and a third coil; the first magnet and the second magnet are disposed symmetrically with each other on the basis of the first direction on the mover; the first coil and the second coil are disposed symmetrically with each other on the basis of the first direction between the housing and the mover; the third magnet is disposed between the first magnet and the second magnet; and the third coil is disposed between the first coil and the second coil, characterized in that the first protrusion includes a first-first protrusion disposed on the first mover outer surface, a first-second protrusion disposed on the second mover outer surface, and a first-third protrusion disposed on the third mover outer surface.