| 摘要 |
A binder 1 includes a first operation portion 41 which is displaced from an unlock position for opening binding rods 3 to a lock position for closing the binding rods 3 when the first operation portion 41 is pushed down, a retaining mechanism 43 for retaining, in the lock position, the first operation portion 41 that has reached the lock position, and a second operation portion 42 for releasing retention of the first operation portion 41 by the retaining mechanism when the second operation portion 42 is pushed down. |
