The present invention aims to provide an actuator unit. When the actuator unit is assembled in a lens driving device and works, a lens support beginning to move cannot be inclined. A spring component (14) is provided with an inner side retaining part (14a), an outer side retaining part (14b), a plurality of wrist parts (14c), a plurality of inner side connecting parts (14e), a plurality of outer side connecting parts (14f) and spoke parts (14g) for connecting the inner side retaining part (14a) with the outer side retaining part (14b) in a releasable manner, wherein the lens support (17) is supported by the spring components (14), and an electromagnetic driving mechanism (22) is utilized for enabling the lens support (17) to move.