To disperssingly transmit gripping force of a gripping hand to prevent idling of a door knob cover, and reduce operation force of a door knob by forming a hanging bell-like door knob cover by an elastic foaming body.

A door knob cover 1 is formed in the form of a hanging bell of an elastic foaming body of natural rubber latex, thickness is about 3 mm at an opening edge and about 11 mm at an intermediate part, and chloroprene latex is applied on the inner peripheral face of a door knob housing part to form the resin coating layer of 0.1 mm. The foaming power of the elastic foaming body is adjusted, 25% compression load value is set to be 40-90 gf/cm2. Thereby gripping force of a gripping hand is dispersed through the door knob cover 1, the whole door knob 8 is tightened and idling of the door knob cover 1 can be prevented by friction force. In the case where the compression load value is excessively small, the relieving effect of the operation force of the door knob is reduced by compression of the elastic foaming body, in addition, in the case if it is excessively large, the gripping force is not transmitted to the door knob and idling is produced.