| 摘要 |
A seesaw button (5) has a first rotation axis (A1) and an opening (53a). A portion of a push button (6) is exposed through the opening (53a), and is displaced independently from the seesaw button (5) in a direction intersecting with the first rotation axis (A1). A first portion (61a) of the push button (6) can face a first edge section (53f) demarcating the opening (53a) of the seesaw button. A cross-sectional surface of the first portion (61a) inside the plane intersecting with the first rotation axis (A2) has a shaped portion corresponding to an arc having the first rotation axis (A1) as the center. |
