Abstract: A computer mouse includes a mouse body, a first input unit, and a second input unit. The mouse body includes a first joint portion and a second joint portion, and the first joint portion and the second joint portion are symmetrically arranged with respect to one another. The first input unit includes a first base and a first button disposed on the first base. The second input unit includes a second base and a second button disposed on the second base. The shape of the first base is corresponding to that of the first joint portion and the shape of the second base is corresponding to that of the second joint portion such that the first input unit and the second input unit are interchangeably respectively disposed on the first joint portion and the second joint.