A camera actuator comprising: a base having an internal accommodation space, being open at both ends thereof in a direction in which light travels, and having at least one opening in an upper surface and at least one opening in a lower surface thereof; at least one driving module comprising two driving units (34a, 34b) each including a substrate fitted in the at least one opening (312a, 312b) of the base, the substrate being mounted with two or more coils on a surface facing the internal accommodation space of the base; and at least one optical module provided in the internal accommodation space of the base and configured to be movable in an optical axis direction, the at least one optical module being mounted with a magnet on a surface facing the substrate, the magnet being positioned to correspond to the coil, wherein the substrates of the at least one driving module are mounted with two or more coils arranged at intervals in a first direction that is parallel to an optical axis, each of the coils has an air-core portion in the center thereof, and two or more Hall sensors each of which is configured to sense a magnetic force of the magnet and which is configured to generate and output a signal corresponding to the sensed magnetic force are mounted in the air-core portions of the two or more coils, respectively, wherein the first opening and the second opening are positioned respectively at a first end portion of the upper surface of the base and at a second end portion of the lower surface of the base, respectively, the upper surface and the lower surface facing each other, the first opening and the second opening being diagonally positioned; wherein the first driving unit is configured to cover the first opening and the second driving unit is configured to cover the second opening; and wherein the at least one optical module comprises a first optical unit and a second optical unit arranged in series in an optical axis direction in the accommodation space, the first optical unit being movable in the optical axis direction within a range of an electric field generated by the coils of the first driving unit, the second optical unit being movable in the optical axis direction within a range of an electric field generated by the coils of the second driving unit. a base having an internal accommodation space, being open at both ends thereof in a direction in which light travels, and having at least one opening in an upper surface and at least one opening in a lower surface thereof; at least one driving module comprising two driving units (34a, 34b) each including a substrate fitted in the at least one opening (312a, 312b) of the base, the substrate being mounted with two or more coils on a surface facing the internal accommodation space of the base; and at least one optical module provided in the internal accommodation space of the base and configured to be movable in an optical axis direction, the at least one optical module being mounted with a magnet on a surface facing the substrate, the magnet being positioned to correspond to the coil, wherein the substrates of the at least one driving module are mounted with two or more coils arranged at intervals in a first direction that is parallel to an optical axis, each of the coils has an air-core portion in the center thereof, and two or more Hall sensors each of which is configured to sense a magnetic force of the magnet and which is configured to generate and output a signal corresponding to the sensed magnetic force are mounted in the air-core portions of the two or more coils, respectively, wherein the first opening and the second opening are positioned respectively at a first end portion of the upper surface of the base and at a second end portion of the lower surface of the base, respectively, the upper surface and the lower surface facing each other, the first opening and the second opening being diagonally positioned; wherein the first driving unit is configured to cover the first opening and the second driving unit is configured to cover the second opening; and wherein the at least one optical module comprises a first optical unit and a second optical unit arranged in series in an optical axis direction in the accommodation space, the first optical unit being movable in the optical axis direction within a range of an electric field generated by the coils of the first driving unit, the second optical unit being movable in the optical axis direction within a range of an electric field generated by the coils of the second driving unit.