| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation button device which is easy to operate without deformation and wearing out of the salient part when a small salient part is arranged on an operating face of a main body button of a main body panel. SOLUTION: A salient part is arranged on an operating face of a first operating button and a concave part is arranged at the backside of a second operation button facing the salient part. When a cover is put on a main body, the salient part of the first operating button is to be housed in the concave part of the second operating button, and at the same time, it is so designed that the operating face other than the salient part of the first operating button makes close contact with the face other than the concave part of the second operating button.
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