| 摘要 |
Provided is an operation input device to be attached to a base having a recessed portion including a side surface that faces one end of the base. The operation input device includes: a side surface portion formed into a shape corresponding to the side surface of the recessed portion; and first and second holding portions which fix the operation input device to the base by sandwiching the base, in which: a surface of one of the holding portions, which contacts the base, is bent toward the other holding portion; a tip end portion of the first holding portion moves toward an opposite side to the second holding portion, whereby the operation input device is attached to or detached from the base; and the side surface portion contacts with the side surface of the recessed portion, when the operation input device is attached to the base.
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