There is provided a laptop personal computer comprising: a first chassis accommodating a display section and having a basic shape of substantially rectangle in a planar view; a second chassis accommodating an operation control section and having a basic shape of substantially rectangle in a planar view; and a hinge mechanism for coupling one side of the second chassis and one side of the first chassis and supporting both chassis in a relatively openable and closable manner; wherein an other side parallel to the one side of the first chassis is configured so that only its central portion in a widthwise direction parallel to the one side lays side-by-side to form substantially flat face with an other side of the second chassis in a state where the first chassis is closed together with the second chassis, and wherein the other side of the first chassis is configured, in a planar view, so that the more it departs from the central portion toward an edge portion in the widthwise direction, the more it comes closer to the one side of the first chassis than to the other side of the second chassis in a state where the first chassis is closed together with the second chassis.