The narrowed space the aim the device several in real estate agent wound around the map according to the necessity a state that all of the first and the ball holes along length map said one by one so that a work as well as the atmosphere' s office real estate agent cleanly reducing the distance between the map can be to be provided to, and road residential street and shopping center the aim said painted and the like in a map, said map is acted in a state being winding to unfolded a case; when said and extends the map is fixed at arbitrary position is map of the same spring between are installed between the heat generation stopper; and said piston is coupled to the return downwards in the roll-out map situ a fixing state of a on which stoppers wound so changes characterized by including so a to. achieved by map.