Patent ID: 7738656

Claim:
A portable terminal device comprising: two cases arranged to be able to be mutually overlapped; a coupling unit that mutually and rotatably couples the two cases about an axis extending in the direction of overlapping; a reinforcing member that is fixed within one of the two cases and is arranged between a first circuit board and an operating key board; and a position detection unit that detects the relative positions of the two cases, wherein the coupling unit comprises: a hollow rotation shaft that is rotatable about the axis of overlap; and a bearing section that axially supports the rotation shaft so as to allow rotation of the rotation shaft, and the bearing section is attached to the reinforcing member, the first circuit board is provided within one of the cases, and the position detection unit comprises: a magnet located near the periphery of the axis and fixed to the other case; and magnetic sensors that are provided on the first circuit board so as to oppose predetermined locations of movement path of the magnet about the axis and that detect the magnetism of the magnet.