Mouse wheel device

A mouse wheel device adapted for being assembled in a mouse, comprising:

• a mouse wheel assembly including
• at least two scroll wheels, each of the scroll wheels having a through hole axially penetrating through a center thereof, the outer side surface of the scroll wheel defining a plurality of meshing grooves arranged at regular intervals along the periphery thereof,
• at least two wheel shafts, each scroll wheel being axially mounted to the middle of one of the wheel shafts via the through hole, and
• a track sheathed on the outer side surfaces of the scroll wheels with the scroll wheels being apart arranged side-by-side, the inner surface of the track protruding inward to form a plurality of meshing ribs arranged at regular intervals along the inner periphery thereof and engaged with the meshing grooves of the scroll wheels;
• and
• a mounting bracket, the mouse wheel assembly being pivoted to the mounting bracket through two ends of each wheel shaft,
• wherein one long side of the track along the arrangement direction of the scroll wheels is exposed outside the mouse, when the exposed long side of the track is actuated, the track drives the scroll wheels and the wheel shafts to rotate in the same direction.