Slide Fold Stack is a hinge part structure of a folding door. The hinge part connects the main door and the auxiliary door, which are supported by the shaft and can be rotatable. In the above-mentioned hinge structure of the hanging folding door device, a side end member having a substantially U-shaped cross-section is attached to the side end of the main door and the auxiliary door, and a hinge is formed at the front end of one arm of the side end member, and a hinge is formed at the other end of the side end member. The front end of one arm forms a trim cover.

Then, the shaft protruding from the joint member is inserted into the shaft hole of the hinge to connect the main door and the auxiliary door, and the hinge cover is fixed in a state of being held between the upper and lower joint members with screws across the two hinges, and the hinge is inserted into the hinge. The main tooth that is concentric with the shaft of the shaft hole is provided with the auxiliary tooth meshing with the main tooth, and at the same time, the two auxiliary teeth are meshed with each other.