A portable information device includes a hinge device, a foldable display, and a bezel member. The hinge device has a first base plate fixed to the first chassis, a second base plate fixed to the second chassis, a first link arm having a first end portion rotatably connected to the first base plate through a first shaft, a second link arm having a first end portion rotatably connected to the second base plate through a second shaft, and a coupling plate having a first end portion rotatably connected to a second end portion of the first link arm through a third shaft and a second end portion rotatably connected to a second end portion of the second link arm through a fourth shaft. The hinge device as a whole is disposed under a display surface, regardless of opening/closing state of the second chassis with respect to the first chassis.