| 摘要 |
A problem of the present invention is that, when a mobile phone set has been dropped or so in a folded state of casings and a force of impact has been exerted on either of the upper and lower casings, the force of impact can be restrained from affecting a hinge part to the possible least extent, thereby enhancing reliability of the hinge part, and at the same time, a panel face of a display part is prevented from being damaged due to contact with an operating part. In order to solve the above described problem, according to the present invention, there is provided a protrusion 5 for preventing sway of the upper casing 1 in a vertical direction when the upper and lower casings are in a folded state, on an end face of the lower casing 2 at its distal end side which is opposite to an end face at a base end side to which the hinge part 3 is fitted. In addition, there are provided protrusions 6 for preventing sway of the upper casing 1 in a lateral direction when the upper and lower casings are in a folded state, on end faces of the lower casing 2 at both sides thereof.
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