US Patent 10001811 Portable information device

A portable information device that can stably support a foldable display is provided. A portable information device includes: a first chassis member and a second chassis member, inner end surfaces, which are adjacent edges, of the first chassis member and the second chassis member being coupled to each other by a hinge mechanism so that the first chassis member and the second chassis member are foldable in two; a display that is disposed at inner surfaces of both the first chassis member and the second chassis member and that is foldable in two; and a first support plate and a second support plate supporting a back surface of the display.