| 摘要 |
A mouse M that is used as a pointing device for an information processing unit such as a personal computer comprises a body 1 having at least a button as an input operating portion, a traveling direction detecting portion 3 that detects a direction of traveling by the use of an optical means and a sliding portion 23 made of a skiddy material is arranged to surround the traveling direction detecting portion 3 and is so arranged that the sliding portion 23 forms a bottom face of the mouse M in order to move the mouse M with ease and to protect the traveling direction detecting portion from dust.
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