Abstract: A magnetic clutch 1 having a rotor 2, an armature 3 having a friction surface 31 disposed opposite and engaged by the friction surface 21 of the rotor 2, an electromagnetic coil 4 for attracting the armature 3 to the side of the rotor 2, and a rubber hub 5 for transmitting the rotational power to driven equipment. The rubber hub 5 is composed of an outer hub 51 fixed to the armature 3, an inner hub 52 connected to the driven equipment, and a rubber part 53 disposed between the outer hub 51 and the inner hub 52. On a surface of the armature 3, a corrosion-preventive coated film is formed by electrodeposition-coating. A powder coated film 6 having a function of preventing adhesion between the armature 3 and the rubber part 53 is formed on a surface of the outer hub 51, on a surface of the inner hub 52, and on a rubber seating surface 531 of the rubber part 53.