US Patent 10067536 Portable information device

A portable information device is capable of stably supporting a foldable display. The portable information device has a first engagement piece which is provided in a first support plate, projects from the inner end surface side of the first support plate, and contacts/separates from a second support plate when a first chassis member and a second chassis member are opened/closed, and a second engagement piece which is provided in the second support plate, projects from the inner end surface side of the second support plate, and contacts/separates from the first support plate when the first chassis member and the second chassis member are opened/closed.