Actuator and optical unit

An actuator capable of connecting a lens unit, which has a lens installation portion in which a lens is installed and a first connection portion with a diameter smaller than that of the lens installation portion, and a sensor unit, which has a large diameter portion with a diameter larger than that of the first connection portion and a second connection portion with a diameter smaller than that of the large diameter portion, the actuator comprising:

• a movable body having a first insertion port into which the first connection portion can be inserted from a first direction in an optical axis direction and a second insertion port into which the second connection portion can be inserted from a second direction opposite to the first direction;
• and
• a fixed body holding the movable body in a rotatable manner with at least one direction of intersecting directions intersecting with the optical axis direction as a rotation axis.