An index wheel having notations adopted on an electronic device to be freely rotated to generate signal command output includes at least an inner axis layer and an operation layer encasing the inner axis layer in a coaxial manner and movable together at the same time. The operation layer is made from a ceramic material and formed integrally by molding and sintering. The operation layer also has a graphic notation zone on the surface that contains desired graphics or texts. Thus the profile of the index wheel is more versatile and provides a greater appeal to users.