The invention discloses a computer input device, in particular to a ring-type mouse. The ring-type mouse comprises a mouse shell, a mouse wheel arranged at the bottom of the mouse shell, a ring clasp arranged on the right side of the mouse shell, a ring shell threading through the ring clasp, and a key arranged on the left side of the mouse. Mouse circuit components are arranged in the mouse shell. A photoelectric hole is arranged at the front end of the bottom of the mouse. The mouse wheel is arranged in the incline position at the rear end of the bottom of the mouse. A finger moves the mouse, and operates the key and the mouse wheel through the ring shell. The ring-type mouse is compact in volume, which is just 1/4 of a general mouse, and can be operated easily with one finger. By adopting the ring-type mouse, all of the functions of a mouse can be operated and controlled through just two fingers; the requirements of the smoothness, the position, the arrangement and the hang of an underlay are not high. A user keeps natural and relaxed when holding the ring-type mouse with a hand, so that the possibility of hand tired feeling is little. Accordingly, the ring-type mouse is particularly applicable for computer players for fun.