A suspension structure of the present embodiment conveys an optical fiber preform into a drawing furnace. A suspension portion formed in a depressed shape or a projected shape or as a hole is formed in a dummy rod connected on an upper side of the optical fiber preform conveyed into the drawing furnace. The suspension structure includes: a joining mechanism configured to cover at least a part of circumference of the dummy rod and include an arm that extends on both sides in a direction perpendicular to a drawing direction and a retention portion that engages with the suspension portion and retains the optical fiber preform; and an engagement mechanism including a gripping portion with which the arm engages and which hangs the optical fiber preform.