A vibration-damping electromagnetic actuator including: a tubular stator; a movable member displaceable relative to the stator in an axial direction, and being inserted in the stator; a housing including a tubular peripheral wall and being attached to the stator; a support rubber elastic body elastically connecting the movable member to the housing; and a coil member and an armature displaceable relative to the coil member disposed at one and the other of the stator and the movable member respectively. The stator is arranged in an inner periphery of the peripheral wall, and a gap is provided between the peripheral wall and the stator in an axis-perpendicular direction. The stator is attached to the housing in a state aligned with the movable member by means of displacement of the stator relative to the housing in the axis-perpendicular direction.

An electronic semi active control engine mount having a variable air chamber includes a variable air chamber diaphragm that absorbs the exciting force of fluid due to an external force by elastically deforming. An air chamber supports the variable air chamber diaphragm with the atmospheric pressure. A fork is separated from the diaphragm to keep the air chamber into which air flows in idling of an engine, and comes in close contact with the variable air chamber diaphragm to remove the air chamber into which the air flows when a vehicle is driven. An actuator either separates the fork from the variable air chamber diaphragm or allows the fork to be in close contact with the variable air chamber diaphragm.