To open/close a door by rotating a door knob by winding a ribbon by a half round on the door knob, connecting a grip to the ribbon by fixing the grip by a pressure sensitive adhesive tape, suspending a pedal from the lower end of the door, and operating the grip and the pedal.

A pedal 5 is attracted to a lower end part of an existing door by a sucker 12 and a magnet 13, and a pressure sensitive adhesive tape is used instead of the magnet 13. Next, a toe stopper 7 is attached to a pedal 5 to place only a toe to be formed in a heel protruding shape. In that case, an operation string 4 is connected to a position higher than the toe of the toe stopper 7, an inclination is imparted to an upper part of the toe stopper 7, and an antislipping member 8 is stuck to the pedal 5. Thus, an equal function is constituted of only a combination of an existing rotary door knob and a fixing pressure sensitive adhesive tape 2, and this auxiliary tool can be made by hand out of an easy material in a short time. Thus, the existing door knob is rotated by lowering a grip 3 by using an elbow and the jaws, and when holding a cargo by both hands, the door can be opened/closed by using a foot.