Portable information device and display assembly

A portable information device includes: a first chassis member; a second chassis member foldably coupled to the first chassis member; a display provided across an inner surface of the first chassis member and an inner surface of the second chassis member, the display being foldable and a touch panel being stacked on the display; and a sheet member fixed to a back side of the display. The sheet member includes: a first layer portion provided with a plurality of holes at least in a part overlapping a bent portion of the display; and a second layer portion entirely covering the first layer portion, the second layer portion being made up of a conductor that is thinner than the first layer portion and having no hole at least in a location overlapping a wiring region of the touch panel.