| 摘要 |
The invention comprises: a key top (21) exposed from a key top opening (11a); and a key support part (22) coupled to the key top (21) and having a flange portion (22a), which prevents disengagements, disposed on the peripheral bottom side of the key top opening (11a). The key top (21) is movable relative to the key top opening (11a) in the push direction and is prevented from disengaging from the key top opening (11a). |
