An electronic actuator according to the present invention comprises: a shaft; a bobbin; a nut; an upper bushing; a housing; a bearing; and a lower bushing. The shaft rotates by receiving a rotational force from an engine crank shaft. The bobbin is mounted to surround the middle portion of the shaft, wherein the bobbin has a coil wound inside thereof. The nut is made of a magnetic material and mounted to surround one side in the longitudinal direction of the shaft, while being screw-connected to a clutch. The upper bushing is made of as nonmagnetic material and is press-fit between the one side in the longitudinal direction of the shaft and the nut, so as to connect the shaft and the nut to form a single body. The housing is made of a magnetic material and comprises a bottom plate and a side wall to surround the other side in the longitudinal direction of the shaft, wherein the side wall extends to partially overlap the nut. The bearing is mounted on the outer peripheral surface on the other side in the longitudinal direction of the shaft, positioned inside the housing. The lower bushing is made of a nonmagnetic material and is press-fit between the bearing and the housing so as to connect the bearing and the housing to form a single body.