| 摘要 |
To provide a switching device for selecting an operational instruction and deciding the operational instruction and a portable terminal device having the same switching device capable of preventing a malfunction of the switching device. The switching device comprises a decision switch 4, selection switches 5a, 5b, a key base 6, a guide 9, a key top 12 and the like, and it is constituted in that the pressure on central portion of the key top is transmitted to the decision switch through the key base and the force of tilting the key top toward a center axis is transmitted to the selection switches through the guide and the key base. Additionally to this structure, an interstice is provided between the key top and the guide, the decision switch is formed by a domed switch of more layers than the selection switch, an interstice is provided between the decision switch and the key base, and through holes 8a, 8b are provided in the key base respectively between the portion corresponding to the upper portion of decision switch and the respective portions corresponding to the upper portions of the selection switches.
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