A retraction mechanism includes a striker provided in either a fixed body or a movable body which is movably supported by the fixed body; a catcher provided in the other body and engaging the striker at a predetermined moved position of the movable body to be capable of engaging and disengaging; and an urging device enabling to accumulate urging forces in a moving process of the movable body. The retraction mechanism retracts the movable body by the urging forces accumulated in the urging device in a state wherein the striker and the catcher are engaged. The retraction mechanism includes a guide device controlling a relative position between the striker and the catcher, and when the striker and the catcher change the relative position, the change thereof is absorbed by the guide device, so that the engagement becomes possible.