| 摘要 |
A track ball capable of preventing foreign matter such as water and dirt from entering the inside of a case having a sensor substrate stored therein, wherein a rotating body (4) and a rotation sensor (5) are installed separately from each other through the case (2) so that the foreign matter such as water and dirt can be prevented from entering from a ball side space (SB) continued with an environment on the outside of the track ball into a case internal space (SI) having the sensor substrate (6) stored therein, and the case portions (2A) and (2B) of the case (2) separating at least the rotating body (4) and the rotation sensor (5) from each other and forming a part of an electromagnetic wave transmission route for detecting detected electromagnetic wave by the rotation sensor (5) can transmit the electromagnetic wave detectable by the rotation sensor (5). <IMAGE>
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