Abstract: To provide an electromagnetic actuator, having a large stroke and capable of producing the maximum thrust at a retreated stroke end, which is simple in structure and easy to manufacture. The electromagnetic actuator comprises an electromagnetic coil 1, a magnetic frame 3 arranged on the periphery thereof, a movable iron core 5 slidable in a central hole 4 of the coil 1, a first sleeve 6 coupled with the magnetic frame 3 at one end side of the central hole 4 of the coil, and a second sleeve 7 coupled with the magnetic frame 3 at the other end side of the central hole 4. The second sleeve 7 is spaced from the first sleeve 6 with a space (A+C) in the axial direction, and has an end thereof opposing the first sleeve 6 extended to a position in close proximity to the movable iron core 5 when the movable iron core 5 is at the retreated stroke end, but without being substantially fitted thereon, and extended to a position apart therefrom by a micro-distance A.