Abstract: A horizontal-pulling roll screen door for which the right/left hand can be set or changed easily and safely even by a layman and in a screen door in which a net wound up by a winding shaft of a movable stile is made capable of opening/closing by horizontal pulling. First and second caps rotatably supporting the winding shaft are mounted at the both ends of the movable stile capable of replacement by each other. A lock mechanism which can hold a locked state as necessary is provided between a connecting cylindrical shaft connected to the winding shaft and an intermediate support member connected to the first or the second cap unrotatably and removably. Rotation of the winding shaft by an urging force of a winding spring is prevented by this lock mechanism even when the both caps are removed for assembling or change of the right/left hand.