To provide a vibration controlling actuator of improved structure establishing the intended output characteristics efficiently and stably by coupling an output member with an armature easily and precisely.

A projection on the armature 132 of an inner rod 86 is used as a part 92 for caulking while a caulking part 144 of an engaging member 140 is caulked fast to the part 92, and thereby the engaging member 140 is secured to the projection on the inner rod 86, and an energizing means 146 is provided to exert an energizing force to the armature 132 in the slipout direction from the inner rod 86, and the engaging member 140 is laid overlapping and held abutting to the side face of the armature 132 on the inner rod 86 protruding side in such a condition that a sliding displacement in the axial perpendicular direction is admitted.