A mouse device comprising a base, a first circuit board, a scroll wheel bearing, a light-emitting component and a scroll wheel. The first circuit board is disposed on the base. The scroll wheel bearing is mounted to the base. The light-emitting component is disposed on the scroll wheel bearing, and is electrically connected to the first circuit board. The scroll wheel is rotatably connected to the base and the scroll wheel bearing. The light-emitting component is disposed between the scroll wheel and the scroll wheel bearing. By disposing the light-emitting component in the scroll wheel, the light emitted from the light-emitting component would pass through the scroll wheel and the scroll wheel bearing to the outside, which can be evenly emitted from each side of the scroll wheel and the scroll wheel bearing for even light distribution and scrolling without obstruction.