| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile telephone the keys of which do not damage other parts and the thickness of which in a folded state can be made thin. SOLUTION: A key 5 has a hollow 100 formed on a face of the key on which a finger of a user is depressed, and a projection 6 is provided to the hollow 100. The depth of the hollow 100 is selected the same as the height of the projection 6 or deeper than the height of the projection 6.
|
