To solve such a problem of an electromagnetic actuator in the prior art that the contact area becomes uneven because of backlash caused by machining or the structure and stability of attraction cannot be maintained.

An electromagnetic actuator includes a first yoke having a pair of armature pieces consisting of a magnetic material and facing each other, an exciting coil which is wound around a bobbin arranged between the pair of armature pieces of the first yoke and generates a desired electromagnetic force when the exciting current is conducted, a moving element inserted into the bobbin and consisting of a magnetic material which is driven to reciprocate by the magnetic field of the exciting coil and is brought into contact with the armature piece and attracted thereto, a permanent magnet arranged between the first yoke and the bobbin in order to generate magnetic flux in the first yoke and to attract and hold the moving element, and a second yoke constituting a magnetic circuit along with the permanent magnet, wherein a contact opening consisting of a hole elongated in the direction perpendicular to the attraction direction of the permanent magnet is formed at a position of the armature piece where the moving element comes into contact therewith.