| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an operation key in which operability of plural keys which are arranged adjacently is improved.SOLUTION: The operation key comprises plural keys (direction keys) 22 arranged adjacently (22U, 22D, 22R, 22L), and the plural keys 22 are individually operated, or adjacent keys 22 are simultaneously operated. On an operation surface (upper surface of an operation part 221) of the respective key 22, on at least part of a portion facing the adjacent key, a salient 2X1 is formed. By touching the salient 2X1 of one key by a fingertip, single operation of the key is possible by touch feeling at the fingertip. When the salients 2X1 of the adjacent two keys 22 are touched simultaneously for simultaneously operating the two keys 22, simultaneous operation of the adjacent two keys by touch feeling at the fingertip is possible, resulting in improved key operability.</p> |
