Portable information device and display assembly

A portable information device comprising:

• a first chassis;
• a second chassis adjacent to the first chassis and that is coupled to the first chassis, wherein the second chassis is rotatable relative to the first chassis between:
• a flat plate form in which the first chassis and the second chassis are lined up in a direction perpendicular to a surface normal direction, and
• a folded form in which the first chassis and the second chassis are disposed to overlap each other in the surface normal direction;
• a first plate fixed to the first chassis;
• a second plate fixed to the second chassis to be adjacent to the first plate and having a second end face that faces a first end face of the first plate in the flat plate form;
• a sheet-shape display having a first region fixed to a surface of the first plate, a second region fixed to a surface of the second plate, and a bending region that straddles the first end face and the second end face between the first region and the second region;
• a first locking piece protruding from the first plate beyond the first end face to be able to come into contact with and separate from the second plate;
• a second locking piece protruding from the second plate beyond the second end face to be able to come into contact with and separate from the first plate;
• and
• a protruding part that protrudes from at least one of the first end face and the second end face toward the other one of the first end face and the second end face and that contacts the other one of the first end face and the second end face in the flat plate form, wherein
• in the flat plate form, the protruding part overlaps the first locking piece and the second locking piece in a thickness direction of the first plate and the second plate.