To provide a small-size actuator with improved mounting performance.

This actuator is provided with a rotation driving mechanism M fixed to a casing 37, a hypoid pinion 39 integrally rotating with an output shaft of the rotation driving mechanism, a hypoid wheel 41 geared with the hypoid pinion 39, a connecting pin 51 fixed to a position deviated from the rotation center of the hypoid wheel 41, a spherical member 55 having the connecting pin 51 penetrating therethrough, an annular spherical bearing member 54 rotationally fitted around the outer circumference of the spherical member 55, a stopper member 48 regulating the detachment of the spherical member 55 and the spherical bearing member 54 from the connecting pin 51, and a rod 28 fixed to the spherical bearing member 54.