The base is metal, the top is plastic. When I attached the top to the base with the provided screws, only 4 of the 6 screws would go in because the plate with the holes in it hadn't been drilled correctly. It seems pretty stable, though, so it's probably fine. It's sturdy, but you can't use it without the cushion because you can see the screw holes under the cushion. Wish I had known that, but oh well.