To smooth the function of a small relay without attracting an armature even if the magnetic lines of force generated when a current is fed to a coil, are conducted to a yoke, by providing a projection made of the same material as that of a card on the back face side near the upper end section of the card constituting a relay, bringing a tip end section into contact with the front face of the yoke when the armature is returned, and generating a clearance between the upper end portion of the armature and the yoke.

Even when a current is fed to a coil 23 and a core 21 is excited and magnetic lines of force are conducted to a yoke 24, an armature 29 is attracted to the core 21 against a hinge spring 30 because the armature 29 is magnetically interrupted by a projection 33. The upper end section of the armature 29 presses the back face of a card 31, the card 31 presses moving contact pieces 27, 27 forward, and moving contact points 28, 28 are brought into contact with fixed contact points 26, 26. When the current feed to the coil 23 is stopped and the core 21 is de-excited, the armature 29 is returned by the excitation of the hinge spring 30 without being attracted to the yoke 24.