Mouse device

A mouse device, comprising:

• a casing;
• a circuit board disposed within the casing;
• and
• two button modules, wherein each button module comprises an electronic switch, a button lid, a first protrusion post, a second protrusion post and a buffering structure, wherein the electronic switch is disposed within the casing and electrically connected with the circuit board, an end of the button lid is connected with the casing, the first protrusion post is disposed on a bottom surface of the button lid, the second protrusion post is disposed on the bottom surface of the button lid, the buffering structure is disposed on the casing and aligned with the second protrusion post, and the second protrusion post is inserted into a buffering hole of the buffering structure, wherein when the button lid is in an undepressed state, a distance between the buffering structure and the second protrusion post along a first lateral direction or a second lateral direction is not larger than a predetermined length, wherein while the button lid is switched from the undepressed state to a depressed state or the button lid is switched from the depressed state to the undepressed state, the buffering structure is contacted with the second protrusion post along the first lateral direction and/or the second lateral direction when a pressing force is not uniformly distributed on the button lid, and the buffering structure is not contacted with the second protrusion post along the first lateral direction and/or the second lateral direction when the pressing force is uniformly distributed on the button lid.