A portable information device includes a chassis and a cover device to cover the back surface of the chassis. The cover device includes a hinge device that rotatably supports a stand cover section between a stored position and a standing position. The hinge device includes: a first shaft; a second shaft; an intermediate shaft having a first end coupled to one end of the first shaft and a second end coupled to one end of the second shaft; and a first base bracket, a first stand bracket, a second base bracket, and a second stand bracket.