An electromagnetic actuator comprising a fixed magnetic pole (11) applied with an electromagnetic coil (14), and a movable magnetic pole (20) provided in the insertion hole (12) of the fixed magnetic pole movably in the axial direction. The movable magnetic pole is provided with a projecting portion (22) tapered along its moving direction, a recessed taper portion (13) corresponding to the projecting taper portion of the movable magnetic pole is formed at the insertion hole of the fixed magnetic pole, and a tubular auxiliary magnetic pole (40) extending in the axial direction from the opening end of the recessed taper portion is provided continuously to the fixed magnetic pole.