The present invention relates to an optical mouse in which the optical sensor unit of the optical mouse is installed in front of the mouse body so that the pointer of the screen has a large movement even when the mouse body is slightly moved.;The technical configuration is that the scroll wheel 30 is provided in front of the mouse main body 20 of the optical mouse 10, the light emitting diode is provided at the bottom of the mouse main body 20, the reflection of the diode An optical sensor 40 is installed to receive the light, and the optical sensor 40 is installed in the YC direction, which is the front of the central axis XC direction of the scroll wheel 30 installed in front of the mouse body 20, At this time, the optical sensor 40 is to be installed close to one side of the bottom longitudinal axis XD of the mouse main body 20.
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