the electromagnetic clutch comprises a rotor connected to a drive source , an inner hub connected to a device that follows , an outer plate provided on the outside of the inner hub so as to enclose it , an armature coupled to the outer plate and opposing the rotor , an elastic member provided between the inner hub and the outer plate and adhered thereto , and an electromagnetic coil for , when magnetized , attracting the armature together with the outer plate to make them come into contact with the rotor , and when demagnetized , separating the outer plate and the armature from the rotor . because of the configuration in which the armature and the outer plate are coupled in a heat - transmissible manner , a part of elastic member is formed so that heat is transmitted from at least a part of the armature to the part of the elastic member as if they are one piece .