To provide a gate door capable of facilitating the mounting of a face plate to the inside of a stile frame, at the same time, also facilitating the exchange of a handle or the like and preventing the increase of the number of components for the stile frame to rationalize a member at a low cost.

This gate door 1 is so constituted that a face plate 2 is fitted in a rectangular stile frame 3. A first stile A constituting one side 3a of the stile frame 3 is connected to a second stile B adjacent thereto through a joint metal fixture D in a rotatable manner. The first stile A is connected to a third stile C adjacent thereto through a mounting device E in a detachable manner. A rail section 7 for holding the face plate 2 to be slidingly inserted from one side 3a side of the stile frame 3 is provided on the opposed surface to the second and third stiles B and C. When the first stile A is opened, the end 7a of the rail section 7 is exposed to the opened one side 3a side of the stile frame 3 to make it possible to slidingly insert the face plate 2 from the horizontal direction. Then, when the first stile A is closed, the end 7a of the rail section 7 is closed with the first stile A.